morph dataloader specific (#13259)

In the metadata GraphQL api, we need the resolveField for the
morphRelations. This PR implements this topic.


Fixes https://github.com/twentyhq/core-team-issues/issues/1234

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/dataloaders/dataloader.interface.ts

@@ -4,6 +4,7 @@ import {
   FieldMetadataLoaderPayload,
   IndexFieldMetadataLoaderPayload,
   IndexMetadataLoaderPayload,
+  MorphRelationLoaderPayload,
   RelationLoaderPayload,
 } from 'src/engine/dataloaders/dataloader.service';
 import { FieldMetadataDTO } from 'src/engine/metadata-modules/field-metadata/dtos/field-metadata.dto';
@@ -23,6 +24,16 @@ export interface IDataloaders {
     }
   >;
 
+  morphRelationLoader: DataLoader<
+    MorphRelationLoaderPayload,
+    {
+      sourceObjectMetadata: ObjectMetadataEntity;
+      targetObjectMetadata: ObjectMetadataEntity;
+      sourceFieldMetadata: FieldMetadataEntity;
+      targetFieldMetadata: FieldMetadataEntity;
+    }[]
+  >;
+
   fieldMetadataLoader: DataLoader<
     FieldMetadataLoaderPayload,
     FieldMetadataDTO[]