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/core-modules/feature-flag/enums/feature-flag-key.enum.ts

@@ -13,4 +13,5 @@ export enum FeatureFlagKey {
   IS_IF_ELSE_ENABLED = 'IS_IF_ELSE_ENABLED',
   IS_SSE_DB_EVENTS_ENABLED = 'IS_SSE_DB_EVENTS_ENABLED',
   IS_COMMAND_MENU_ITEM_ENABLED = 'IS_COMMAND_MENU_ITEM_ENABLED',
+  IS_FILES_FIELD_ENABLED = 'IS_FILES_FIELD_ENABLED',
 }

packages/twenty-server/src/engine/core-modules/open-api/utils/generate-random-field-value.util.ts

@@ -141,6 +141,10 @@ export const generateRandomFieldValue = ({
       return [];
     }
 
+    case FieldMetadataType.FILES: {
+      return null;
+    }
+
     case FieldMetadataType.TS_VECTOR: {
       throw new Error(
         `We should not generate fake version for ${field.type} field`,

packages/twenty-server/src/engine/core-modules/record-crud/zod-schemas/record-properties.zod-schema.ts

@@ -9,6 +9,7 @@ import { z } from 'zod';
 
 import { RelationType } from 'src/engine/metadata-modules/field-metadata/interfaces/relation-type.interface';
 
+import { filesFieldSchema } from 'src/engine/api/common/common-args-processors/data-arg-processor/validator-utils/validate-files-field-or-throw.util';
 import { type ObjectMetadataForToolSchema } from 'src/engine/core-modules/record-crud/types/object-metadata-for-tool-schema.type';
 import { type FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
 import { isFieldMetadataEntityOfType } from 'src/engine/utils/is-field-metadata-of-type.util';
@@ -243,6 +244,10 @@ export const generateRecordPropertiesZodSchema = (
         });
         break;
 
+      case FieldMetadataType.FILES:
+        fieldSchema = filesFieldSchema;
+        break;
+
       default:
         fieldSchema = getFieldZodType(field);
         break;