Files v2 - Add new FILES field type (#17236)

In this PR : 
- New field type FieldMetadataType.FILES added (as jsonb in DB)
- Backend: GraphQL types, validation, REST API schema, data processor
handling
- Frontend: field configuration in settings
- Feature flag IS_FILES_FIELD_ENABLED to gate the feature
- Integration tests for create/filter validation
- Dev seed: Feature flag enabled + FILES field on survey result object


To do in next PRs : 
- Backend : 
-- new workspaceFile controller (for download) & new workspaceFile
upload resolver (for upload)
-- pre-hook/post-hook to ensure fileId existence + listener to ensure
cleaning
- Frontend : FILES field display/edit in table view, record, ...

packages/twenty-server/src/engine/metadata-modules/flat-field-metadata/utils/from-create-field-input-to-flat-field-metadatas-to-create.util.ts

@@ -172,6 +172,7 @@ export const fromCreateFieldInputToFlatFieldMetadatasToCreate = async ({
     case FieldMetadataType.NUMERIC:
     case FieldMetadataType.LINKS:
     case FieldMetadataType.CURRENCY:
+    case FieldMetadataType.FILES:
     case FieldMetadataType.FULL_NAME:
     case FieldMetadataType.POSITION:
     case FieldMetadataType.ADDRESS: