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

internal/notification/channels/mock/message.mock.go

@@ -54,16 +54,16 @@ func (mr *MockMessageMockRecorder) GetContent() *gomock.Call {
 	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetContent", reflect.TypeOf((*MockMessage)(nil).GetContent))
 }
 
-// GetTriggeringEvent mocks base method.
-func (m *MockMessage) GetTriggeringEvent() eventstore.Event {
+// GetTriggeringEventType mocks base method.
+func (m *MockMessage) GetTriggeringEventType() eventstore.EventType {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "GetTriggeringEvent")
-	ret0, _ := ret[0].(eventstore.Event)
+	ret := m.ctrl.Call(m, "GetTriggeringEventType")
+	ret0, _ := ret[0].(eventstore.EventType)
 	return ret0
 }
 
-// GetTriggeringEvent indicates an expected call of GetTriggeringEvent.
-func (mr *MockMessageMockRecorder) GetTriggeringEvent() *gomock.Call {
+// GetTriggeringEventType indicates an expected call of GetTriggeringEventType.
+func (mr *MockMessageMockRecorder) GetTriggeringEventType() *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetTriggeringEvent", reflect.TypeOf((*MockMessage)(nil).GetTriggeringEvent))
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "GetTriggeringEventType", reflect.TypeOf((*MockMessage)(nil).GetTriggeringEventType))
 }