Fix flatFieldMetadata transpiler to fit real cache typing (#13529)

# Introduction
The cache is not accurately typed regarding the `fieldMetadataMaps` they
do not contain relations
In this way we:
- Created dedicated transpilation tools for cache manipulation
- Avoided recursivity in transpilation tools
- Fix and finalized the createMany fields metadata service v2
- Refactor the validator to handle validation :)

## What's next:
- Implem integration tests to make things run 🙃 
- migrate existing settings valdiation
- Finish the create object metadata service
- Handle update input transpilation and validation

packages/twenty-shared/src/types/RelationAndMorphRelationFieldMetadataType.ts

@@ -0,0 +1,5 @@
+import { FieldMetadataType } from './FieldMetadataType';
+
+export type RelationAndMorphRelationFieldMetadataType =
+  | FieldMetadataType.RELATION
+  | FieldMetadataType.MORPH_RELATION;

packages/twenty-shared/src/types/index.ts

@@ -17,6 +17,7 @@ export type { NonNullableRequired } from './NonNullableRequired';
 export type { NullablePartial } from './NullablePartial';
 export type { ObjectRecordsPermissions } from './ObjectRecordsPermissions';
 export type { ObjectRecordsPermissionsByRoleId } from './ObjectRecordsPermissionsByRoleId';
+export type { RelationAndMorphRelationFieldMetadataType } from './RelationAndMorphRelationFieldMetadataType';
 export type { RestrictedField } from './RestrictedField';
 export type { RestrictedFields } from './RestrictedFields';
 export type { StepFilterGroup, StepFilter } from './StepFilters';