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/metadata-modules/field-metadata/interfaces/field-metadata-default-value.interface.ts

@@ -76,7 +76,7 @@ export type FieldMetadataDefaultValue<
     ? FieldMetadataDefaultValueForAnyType | null // Could be improved to be | unknown
     : T extends keyof FieldMetadataDefaultValueMapping
       ? FieldMetadataDefaultValueForType<T>
-      : never;
+      : never | null;
 
 type FieldMetadataDefaultValueExtractedTypes = {
   [K in keyof FieldMetadataDefaultValueMapping]: ExtractValueType<

packages/twenty-server/src/engine/metadata-modules/field-metadata/interfaces/field-metadata-options.interface.ts

@@ -18,4 +18,4 @@ export type FieldMetadataOptions<
     ? null | (FieldMetadataDefaultOption[] | FieldMetadataComplexOption[]) // Could be improved to be | unknown
     : T extends keyof FieldMetadataOptionsMapping
       ? FieldMetadataOptionsMapping[T]
-      : never;
+      : never | null;

packages/twenty-server/src/engine/metadata-modules/field-metadata/interfaces/field-metadata-settings.interface.ts

@@ -60,4 +60,4 @@ export type FieldMetadataSettings<
     ? null | AllFieldMetadataSettings // Could be improved to be | unknown
     : T extends keyof FieldMetadataSettingsMapping
       ? FieldMetadataSettingsMapping[T] | null
-      : never;
+      : never | null;