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/field-metadata/field-metadata.exception.ts

@@ -0,0 +1,17 @@
+import { CustomException } from 'src/utils/custom-exception';
+
+export class FieldMetadataException extends CustomException {
+  code: FieldMetadataExceptionCode;
+  constructor(message: string, code: FieldMetadataExceptionCode) {
+    super(message, code);
+  }
+}
+
+export enum FieldMetadataExceptionCode {
+  FIELD_METADATA_NOT_FOUND = 'FIELD_METADATA_NOT_FOUND',
+  INVALID_FIELD_INPUT = 'INVALID_FIELD_INPUT',
+  FIELD_MUTATION_NOT_ALLOWED = 'FIELD_MUTATION_NOT_ALLOWED',
+  FIELD_ALREADY_EXISTS = 'FIELD_ALREADY_EXISTS',
+  OBJECT_METADATA_NOT_FOUND = 'OBJECT_METADATA_NOT_FOUND',
+  INTERNAL_SERVER_ERROR = 'INTERNAL_SERVER_ERROR',
+}