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/utils/get-field-metadata-entity-from-cached-object-metadata-maps.util.ts

@@ -0,0 +1,42 @@
+import { isDefined } from 'twenty-shared/utils';
+
+import { FieldMetadataEntity } from 'src/engine/metadata-modules/field-metadata/field-metadata.entity';
+import { IndexFieldMetadataEntity } from 'src/engine/metadata-modules/index-metadata/index-field-metadata.entity';
+import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
+import { CachedFieldMetadataEntity } from 'src/engine/metadata-modules/types/cached-field-metadata-entity';
+import { ObjectMetadataMaps } from 'src/engine/metadata-modules/types/object-metadata-maps';
+
+export const getFieldMetadataEntityFromCachedObjectMetadataMaps = ({
+  fieldMetadataId,
+  objectMetadataId,
+  objectMetadataMaps,
+}: {
+  objectMetadataMaps: ObjectMetadataMaps;
+  objectMetadataId: string;
+  fieldMetadataId: string;
+}): FieldMetadataEntity | undefined => {
+  const objectMetadataFromCache = objectMetadataMaps.byId[objectMetadataId];
+
+  if (!isDefined(objectMetadataFromCache)) {
+    return undefined;
+  }
+
+  const fieldMetadataFromCache: CachedFieldMetadataEntity =
+    objectMetadataFromCache.fieldsById[fieldMetadataId];
+
+  if (!isDefined(fieldMetadataFromCache)) {
+    return undefined;
+  }
+
+  // We need to determine if graphql will be able to handle relations crafting byitself
+  return {
+    ...fieldMetadataFromCache,
+    object: {} as ObjectMetadataEntity,
+    relationTargetFieldMetadata: null,
+    relationTargetObjectMetadata: null,
+    indexFieldMetadatas: {} as IndexFieldMetadataEntity,
+    fieldPermissions: [],
+    createdAt: new Date(fieldMetadataFromCache.createdAt),
+    updatedAt: new Date(fieldMetadataFromCache.updatedAt),
+  };
+};