Refactor object metadata service (#8123)

## Context
ObjectMetadataService became quite large and handles too many
responsibilities. I'm trying to refactor a bit this part in preparation
of a larger work that will combine object-metadata services and
sync-metadata logic

- Created a STANDARD_OBJECT_ICONS that can be reused in relation
creation to refer to a standard object icon.
- Created a STANDARD_OBJECT_FIELD_IDS that can be used with an object
name to get its standard field ids.
- Moved migration, record and relation creations to dedicated services,
refactored to improve performances and readability
- Refactored some validation logic

---------

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

packages/twenty-server/src/engine/metadata-modules/object-metadata/object-metadata.module.ts

@@ -10,13 +10,15 @@ import { NestjsQueryTypeOrmModule } from '@ptc-org/nestjs-query-typeorm';
 
 import { TypeORMModule } from 'src/database/typeorm/typeorm.module';
 import { FeatureFlagEntity } from 'src/engine/core-modules/feature-flag/feature-flag.entity';
-import { FeatureFlagModule } from 'src/engine/core-modules/feature-flag/feature-flag.module';
 import { WorkspaceAuthGuard } from 'src/engine/guards/workspace-auth.guard';
 import { DataSourceModule } from 'src/engine/metadata-modules/data-source/data-source.module';
 import { FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
 import { BeforeUpdateOneObject } from 'src/engine/metadata-modules/object-metadata/hooks/before-update-one-object.hook';
 import { ObjectMetadataGraphqlApiExceptionInterceptor } from 'src/engine/metadata-modules/object-metadata/interceptors/object-metadata-graphql-api-exception.interceptor';
 import { ObjectMetadataResolver } from 'src/engine/metadata-modules/object-metadata/object-metadata.resolver';
+import { ObjectMetadataMigrationService } from 'src/engine/metadata-modules/object-metadata/services/object-metadata-migration.service';
+import { ObjectMetadataRelatedRecordsService } from 'src/engine/metadata-modules/object-metadata/services/object-metadata-related-records.service';
+import { ObjectMetadataRelationService } from 'src/engine/metadata-modules/object-metadata/services/object-metadata-relation.service';
 import { RelationMetadataEntity } from 'src/engine/metadata-modules/relation-metadata/relation-metadata.entity';
 import { RemoteTableRelationsModule } from 'src/engine/metadata-modules/remote-server/remote-table/remote-table-relations/remote-table-relations.module';
 import { SearchModule } from 'src/engine/metadata-modules/search/search.module';
@@ -46,10 +48,14 @@ import { UpdateObjectPayload } from './dtos/update-object.input';
         WorkspaceMigrationRunnerModule,
         WorkspaceMetadataVersionModule,
         RemoteTableRelationsModule,
-        FeatureFlagModule,
         SearchModule,
       ],
-      services: [ObjectMetadataService],
+      services: [
+        ObjectMetadataService,
+        ObjectMetadataMigrationService,
+        ObjectMetadataRelationService,
+        ObjectMetadataRelatedRecordsService,
+      ],
       resolvers: [
         {
           EntityClass: ObjectMetadataEntity,