feat(domain): Instance APIs with relational tables (#10953)

# Which Problems Are Solved

This PR implements the endpoints listed in
https://github.com/zitadel/zitadel/issues/10443 .

# How the Problems Are Solved

The implementation follows the same pattern as the Organization one.
There are no peculiarities to this PR. The `Update`, `Delete` are
implementing the `Commander` interface, while `Get` and `List`
instance(s) endpoints are implementing the `Querier` interace.

# Additional Context

- Closes #10443
- Depends on #10445

internal/integration/feature.go

@@ -38,13 +38,13 @@ type RelationalTableFeatureMatrix struct {
 // TODO(IAM-Marco): Once we have gotten rid of eventstore, this can be removed
 func RelationalTablesEnableMatrix() []RelationalTableFeatureMatrix {
 	return []RelationalTableFeatureMatrix{
-		{
-			State:      "when relational tables are enabled",
-			FeatureSet: &feature.SetInstanceFeaturesRequest{EnableRelationalTables: gu.Ptr(true)},
-		},
 		{
 			State:      "when relational tables are disabled",
 			FeatureSet: &feature.SetInstanceFeaturesRequest{EnableRelationalTables: gu.Ptr(false)},
 		},
+		{
+			State:      "when relational tables are enabled",
+			FeatureSet: &feature.SetInstanceFeaturesRequest{EnableRelationalTables: gu.Ptr(true)},
+		},
 	}
 }