Refactored and improved seeds (#8695)

- Added a new Seeder service to help with custom object seeds
- Added RichTextFieldInput to edit a rich text field directly on the
table, but deactivated it for now.

packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.service.ts

@@ -752,7 +752,7 @@ export class FieldMetadataService extends TypeOrmQueryService<FieldMetadataEntit
           );
         } else if (error instanceof NameNotAvailableException) {
           throw new FieldMetadataException(
-            `Name "${fieldMetadataInput.name}" is not available`,
+            `Name "${fieldMetadataInput.name}" is not available, check that it is not duplicating another field's name.`,
             FieldMetadataExceptionCode.INVALID_FIELD_INPUT,
           );
         } else {