feat: Instance domains (#3444)

* feat: add domain list

* feat: domain tests

* feat: add redirect url on adding instance domain

* Update internal/command/instance_domain.go

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

* feat: remove unused code

* fix

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

internal/api/grpc/server/middleware/instance_interceptor_test.go

@@ -173,6 +173,10 @@ func (m *mockInstance) ConsoleClientID() string {
 	return "consoleClientID"
 }
 
+func (m *mockInstance) ConsoleApplicationID() string {
+	return "consoleApplicationID"
+}
+
 func (m *mockInstance) RequestedDomain() string {
 	return "localhost"
 }