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-server/src/engine/metadata-modules/object-metadata/object-metadata-v2.service.ts

@@ -41,8 +41,8 @@ export class ObjectMetadataServiceV2 extends TypeOrmQueryService<ObjectMetadataE
       fromCreateObjectInputToFlatObjectMetadata(objectMetadataInput);
     const existingFlatObjectMetadatas =
       fromObjectMetadataMapsToFlatObjectMetadatas(objectMetadataMaps);
-    // @ts-expect-error TODO implement validateFlatObjectMetadataData
-    const createdFlatObjectMetadata = validateFlatObjectMetadataData({
+    // @ts-expect-error TODO implement validateFlatObjectMetadata
+    const createdFlatObjectMetadata = validateFlatObjectMetadata({
       existing:
         // Here we assume that EVERYTHING is in cache and up to date, this is very critical, also race condition prone :thinking:
         fromObjectMetadataMapsToFlatObjectMetadatas(objectMetadataMaps),