feat: instance requests implementation for resource API (#9830)

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# Which Problems Are Solved

These changes introduce resource-based API endpoints for managing
instances and custom domains.

There are 4 types of changes:

- Endpoint implementation: consisting of the protobuf interface and the
implementation of the endpoint. E.g:
606439a172
- (Integration) Tests: testing the implemented endpoint. E.g:
cdfe1f0372
- Fixes: Bugs found during development that are being fixed. E.g:
acbbeedd32
- Miscellaneous: code needed to put everything together or that doesn't
fit any of the above categories. E.g:
529df92abc or
6802cb5468

# How the Problems Are Solved

_Ticked checkboxes indicate that the functionality is complete_

- [x] Instance
  - [x] Create endpoint
  - [x] Create endpoint tests
  - [x] Update endpoint
  - [x] Update endpoint tests
  - [x] Get endpoint
  - [x] Get endpoint tests
  - [x] Delete endpoint
  - [x] Delete endpoint tests
- [x] Custom Domains
  - [x] Add custom domain
  - [x] Add custom domain tests
  - [x] Remove custom domain
  - [x] Remove custom domain tests
  - [x] List custom domains
  - [x] List custom domains tests
- [x] Trusted Domains
  - [x] Add trusted domain
  - [x] Add trusted domain tests
  - [x] Remove trusted domain
  - [x] Remove trusted domain tests
  - [x] List trusted domains
  - [x] List trusted domains tests

# Additional Changes

When looking for instances (through the `ListInstances` endpoint)
matching a given query, if you ask for the results to be order by a
specific column, the query will fail due to a syntax error. This is
fixed in acbbeedd32 . Further explanation
can be found in the commit message

# Additional Context

- Relates to #9452 
- CreateInstance has been excluded:
https://github.com/zitadel/zitadel/issues/9930
- Permission checks / instance retrieval (middleware) needs to be
changed to allow context based permission checks
(https://github.com/zitadel/zitadel/issues/9929), required for
ListInstances

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/query/instance_test.go

@@ -70,7 +70,7 @@ func Test_InstancePrepares(t *testing.T) {
 		{
 			name: "prepareInstancesQuery no result",
 			prepare: func() (sq.SelectBuilder, func(*sql.Rows) (*Instances, error)) {
-				filter, query, scan := prepareInstancesQuery()
+				filter, query, scan := prepareInstancesQuery(Column{}, true)
 				return query(filter), scan
 			},
 			want: want{
@@ -85,7 +85,7 @@ func Test_InstancePrepares(t *testing.T) {
 		{
 			name: "prepareInstancesQuery one result",
 			prepare: func() (sq.SelectBuilder, func(*sql.Rows) (*Instances, error)) {
-				filter, query, scan := prepareInstancesQuery()
+				filter, query, scan := prepareInstancesQuery(Column{}, true)
 				return query(filter), scan
 			},
 			want: want{
@@ -149,7 +149,7 @@ func Test_InstancePrepares(t *testing.T) {
 		{
 			name: "prepareInstancesQuery multiple results",
 			prepare: func() (sq.SelectBuilder, func(*sql.Rows) (*Instances, error)) {
-				filter, query, scan := prepareInstancesQuery()
+				filter, query, scan := prepareInstancesQuery(Column{}, true)
 				return query(filter), scan
 			},
 			want: want{
@@ -253,7 +253,8 @@ func Test_InstancePrepares(t *testing.T) {
 								IsPrimary:    true,
 							},
 						},
-					}, {
+					},
+					{
 						ID:           "id2",
 						CreationDate: testNow,
 						ChangeDate:   testNow,
@@ -282,7 +283,7 @@ func Test_InstancePrepares(t *testing.T) {
 		{
 			name: "prepareInstancesQuery sql err",
 			prepare: func() (sq.SelectBuilder, func(*sql.Rows) (*Instances, error)) {
-				filter, query, scan := prepareInstancesQuery()
+				filter, query, scan := prepareInstancesQuery(Column{}, true)
 				return query(filter), scan
 			},
 			want: want{