Add exceptions for metadata modules (#6070)

Class exception for each metadata module + handler to map on graphql
error

TODO left :
- find a way to call handler on auto-resolvers nestjs query (probably
interceptors)
- discuss what should be done for pre-hooks errors
- discuss what should be done for Unauthorized exception

packages/twenty-server/src/engine/metadata-modules/remote-server/remote-server.exception.ts

@@ -0,0 +1,16 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class RemoteServerException extends CustomException {
+  code: RemoteServerExceptionCode;
+  constructor(message: string, code: RemoteServerExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum RemoteServerExceptionCode {
+  REMOTE_SERVER_NOT_FOUND = 'REMOTE_SERVER_NOT_FOUND',
+  REMOTE_SERVER_ALREADY_EXISTS = 'REMOTE_SERVER_ALREADY_EXISTS',
+  REMOTE_SERVER_MUTATION_NOT_ALLOWED = 'REMOTE_SERVER_MUTATION_NOT_ALLOWED',
+  REMOTE_SERVER_CONNECTION_ERROR = 'REMOTE_SERVER_CONNECTION_ERROR',
+  INVALID_REMOTE_SERVER_INPUT = 'INVALID_REMOTE_SERVER_INPUT',
+}