feat(db): adding relational instance table (#10007)

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# Which Problems Are Solved

Implementing Instance table to new relational database schema

# How the Problems Are Solved


The following fields must be managed in this table:

- `id`
- `name`
- `default_org_id`
- `zitadel_project_id`
- `console_client_id`
- `console_app_id`
- `default_language`
- `created_at`
- `updated_at`
- `deleted_at`

The repository must provide the following functions:

Manipulations:
- create
  - `name`
  - `default_org_id`
  - `zitadel_project_id`
  - `console_client_id`
  - `console_app_id`
  - `default_language`
- update
  - `name`
  - `default_language`
- delete

Queries:
- get returns single instance matching the criteria and pagination,
should return error if multiple instances were found
- list returns list of instances matching the criteria, pagination

Criteria are the following:
- by id

pagination:
- by created_at
- by updated_at
- by name

### instance events

The following events must be applied on the table using a projection
(`internal/query/projection`)

- `instance.added` results in create
- `instance.changed` changes the `name` field
- `instance.removed` sets the the `deleted_at` field
- `instance.default.org.set` sets the `default_org_id` field
- `instance.iam.project.set` sets the `zitadel_project_id` field
- `instance.iam.console.set` sets the `console_client_id` and
`console_app_id` fields
- `instance.default.language.set` sets the `default_language` field
- if answer is yes to discussion: `instance.domain.primary.set` sets the
`primary_domain` field

### acceptance criteria

- [x] migration is implemented and gets executed
- [x] domain interfaces are implemented and documented for service layer
- [x] repository is implemented and implements domain interface
- [x] testing
  - [x] the repository methods
  - [x] events get reduced correctly
  - [x] unique constraints

# Additional Context

- Closes https://github.com/zitadel/zitadel/issues/9935

backend/v3/storage/database/dbmock/database.mock.go

@@ -157,15 +157,16 @@ func (c *MockPoolCloseCall) DoAndReturn(f func(context.Context) error) *MockPool
 }
 
 // Exec mocks base method.
-func (m *MockPool) Exec(arg0 context.Context, arg1 string, arg2 ...any) error {
+func (m *MockPool) Exec(arg0 context.Context, arg1 string, arg2 ...any) (int64, error) {
 	m.ctrl.T.Helper()
 	varargs := []any{arg0, arg1}
 	for _, a := range arg2 {
 		varargs = append(varargs, a)
 	}
 	ret := m.ctrl.Call(m, "Exec", varargs...)
-	ret0, _ := ret[0].(error)
-	return ret0
+	ret0, _ := ret[0].(int64)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
 }
 
 // Exec indicates an expected call of Exec.
@@ -182,19 +183,19 @@ type MockPoolExecCall struct {
 }
 
 // Return rewrite *gomock.Call.Return
-func (c *MockPoolExecCall) Return(arg0 error) *MockPoolExecCall {
-	c.Call = c.Call.Return(arg0)
+func (c *MockPoolExecCall) Return(arg0 int64, arg1 error) *MockPoolExecCall {
+	c.Call = c.Call.Return(arg0, arg1)
 	return c
 }
 
 // Do rewrite *gomock.Call.Do
-func (c *MockPoolExecCall) Do(f func(context.Context, string, ...any) error) *MockPoolExecCall {
+func (c *MockPoolExecCall) Do(f func(context.Context, string, ...any) (int64, error)) *MockPoolExecCall {
 	c.Call = c.Call.Do(f)
 	return c
 }
 
 // DoAndReturn rewrite *gomock.Call.DoAndReturn
-func (c *MockPoolExecCall) DoAndReturn(f func(context.Context, string, ...any) error) *MockPoolExecCall {
+func (c *MockPoolExecCall) DoAndReturn(f func(context.Context, string, ...any) (int64, error)) *MockPoolExecCall {
 	c.Call = c.Call.DoAndReturn(f)
 	return c
 }
@@ -387,15 +388,16 @@ func (c *MockClientBeginCall) DoAndReturn(f func(context.Context, *database.Tran
 }
 
 // Exec mocks base method.
-func (m *MockClient) Exec(arg0 context.Context, arg1 string, arg2 ...any) error {
+func (m *MockClient) Exec(arg0 context.Context, arg1 string, arg2 ...any) (int64, error) {
 	m.ctrl.T.Helper()
 	varargs := []any{arg0, arg1}
 	for _, a := range arg2 {
 		varargs = append(varargs, a)
 	}
 	ret := m.ctrl.Call(m, "Exec", varargs...)
-	ret0, _ := ret[0].(error)
-	return ret0
+	ret0, _ := ret[0].(int64)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
 }
 
 // Exec indicates an expected call of Exec.
@@ -412,19 +414,19 @@ type MockClientExecCall struct {
 }
 
 // Return rewrite *gomock.Call.Return
-func (c *MockClientExecCall) Return(arg0 error) *MockClientExecCall {
-	c.Call = c.Call.Return(arg0)
+func (c *MockClientExecCall) Return(arg0 int64, arg1 error) *MockClientExecCall {
+	c.Call = c.Call.Return(arg0, arg1)
 	return c
 }
 
 // Do rewrite *gomock.Call.Do
-func (c *MockClientExecCall) Do(f func(context.Context, string, ...any) error) *MockClientExecCall {
+func (c *MockClientExecCall) Do(f func(context.Context, string, ...any) (int64, error)) *MockClientExecCall {
 	c.Call = c.Call.Do(f)
 	return c
 }
 
 // DoAndReturn rewrite *gomock.Call.DoAndReturn
-func (c *MockClientExecCall) DoAndReturn(f func(context.Context, string, ...any) error) *MockClientExecCall {
+func (c *MockClientExecCall) DoAndReturn(f func(context.Context, string, ...any) (int64, error)) *MockClientExecCall {
 	c.Call = c.Call.DoAndReturn(f)
 	return c
 }
@@ -975,15 +977,16 @@ func (c *MockTransactionEndCall) DoAndReturn(f func(context.Context, error) erro
 }
 
 // Exec mocks base method.
-func (m *MockTransaction) Exec(arg0 context.Context, arg1 string, arg2 ...any) error {
+func (m *MockTransaction) Exec(arg0 context.Context, arg1 string, arg2 ...any) (int64, error) {
 	m.ctrl.T.Helper()
 	varargs := []any{arg0, arg1}
 	for _, a := range arg2 {
 		varargs = append(varargs, a)
 	}
 	ret := m.ctrl.Call(m, "Exec", varargs...)
-	ret0, _ := ret[0].(error)
-	return ret0
+	ret0, _ := ret[0].(int64)
+	ret1, _ := ret[1].(error)
+	return ret0, ret1
 }
 
 // Exec indicates an expected call of Exec.
@@ -1000,19 +1003,19 @@ type MockTransactionExecCall struct {
 }
 
 // Return rewrite *gomock.Call.Return
-func (c *MockTransactionExecCall) Return(arg0 error) *MockTransactionExecCall {
-	c.Call = c.Call.Return(arg0)
+func (c *MockTransactionExecCall) Return(arg0 int64, arg1 error) *MockTransactionExecCall {
+	c.Call = c.Call.Return(arg0, arg1)
 	return c
 }
 
 // Do rewrite *gomock.Call.Do
-func (c *MockTransactionExecCall) Do(f func(context.Context, string, ...any) error) *MockTransactionExecCall {
+func (c *MockTransactionExecCall) Do(f func(context.Context, string, ...any) (int64, error)) *MockTransactionExecCall {
 	c.Call = c.Call.Do(f)
 	return c
 }
 
 // DoAndReturn rewrite *gomock.Call.DoAndReturn
-func (c *MockTransactionExecCall) DoAndReturn(f func(context.Context, string, ...any) error) *MockTransactionExecCall {
+func (c *MockTransactionExecCall) DoAndReturn(f func(context.Context, string, ...any) (int64, error)) *MockTransactionExecCall {
 	c.Call = c.Call.DoAndReturn(f)
 	return c
 }