Object metadata API create one using workspace migration v2 (#13420)

# Introduction
In this PR we create basic transpilation methods and utils to handle
input to flat, entity to flat, object maps to flat. In order to
transpile everything into a common validation that will be implemented
in another PR

## FieldMetadataEntity typing
Added `never | null` to fields that should never be in order to ease
general abstracted method to pass null, as anw it's what is in the
database

## Todo
- ~~Create a feature flag~~
- Integration test for object creation through metadata api + pg col
introspection and snapshoting

packages/twenty-server/src/engine/twenty-orm/entity-manager/workspace-entity-manager.spec.ts

@@ -112,6 +112,7 @@ describe('WorkspaceEntityManager', () => {
         IS_FIELDS_PERMISSIONS_ENABLED: false,
         IS_CORE_VIEW_SYNCING_ENABLED: false,
         IS_TWO_FACTOR_AUTHENTICATION_ENABLED: false,
+        IS_WORKSPACE_MIGRATION_V2_ENABLED: false,
       },
       eventEmitterService: {
         emitMutationEvent: jest.fn(),