CreateFieldInput transpilation to FlatFieldMetadata, FlatFieldMetadata validation (#13493)

# Introduction
Following https://github.com/twentyhq/twenty/pull/13420

What has been done:
- `CreateFieldInput` transpilation to `FlatFieldMetadata`
- `FlatFieldMetadata` validator service
- A lof of transpilation utils from `input` to `flatObject` or
`flatField`
- Created dedicated v2 api metadata services
- Introducing `inferDeletionFromMissingObjectFieldIndex` in the builder,
to avoid diffing every object and field of the current workspace we
allow only generating create/update migration operations, usefull when
passing by the api metadata


## We still need to in another PR:
- Implement a strong unit test coverage and critical functions and
services
- Finalize flat field metadata validation exception for `options`
`defaultValue` `settings` and `relations`
- Finalize `flatObjectMetadata` validation and v2 service refactor
- Plug the new service when feature flag is enabled

packages/twenty-server/src/engine/metadata-modules/object-metadata/utils/build-default-fields-for-custom-object.util.ts

@@ -117,25 +117,21 @@ export const buildDefaultFieldsForCustomObject = (
 ];
 
 type BuildDefaultFlatFieldMetadataForCustomObjectArgs = {
-  createdAt: Date;
   workspaceId: string;
   objectMetadataId: string;
 };
 
 export const buildDefaultFlatFieldMetadataForCustomObject = ({
-  createdAt,
   workspaceId,
   objectMetadataId,
 }: BuildDefaultFlatFieldMetadataForCustomObjectArgs) => {
   const idField: FlatFieldMetadata<FieldMetadataType.UUID> = {
     type: FieldMetadataType.UUID,
-    createdAt,
     id: v4(),
-    isLabelSyncedWithName: false, // TO CHECK
-    isUnique: true, // Was false before but unsure if normal ?
+    isLabelSyncedWithName: false,
+    isUnique: true,
     objectMetadataId,
     uniqueIdentifier: BASE_OBJECT_STANDARD_FIELD_IDS.id,
-    updatedAt: createdAt,
     workspaceId,
     standardId: BASE_OBJECT_STANDARD_FIELD_IDS.id,
     name: 'id',
@@ -159,13 +155,11 @@ export const buildDefaultFlatFieldMetadataForCustomObject = ({
 
   const nameField: FlatFieldMetadata<FieldMetadataType.TEXT> = {
     type: FieldMetadataType.TEXT,
-    createdAt,
     id: v4(),
     isLabelSyncedWithName: false,
     isUnique: false,
     objectMetadataId,
     uniqueIdentifier: CUSTOM_OBJECT_STANDARD_FIELD_IDS.name,
-    updatedAt: createdAt,
     workspaceId,
     standardId: CUSTOM_OBJECT_STANDARD_FIELD_IDS.name,
     name: 'name',
@@ -189,13 +183,11 @@ export const buildDefaultFlatFieldMetadataForCustomObject = ({
 
   const createdAtField: FlatFieldMetadata<FieldMetadataType.DATE_TIME> = {
     type: FieldMetadataType.DATE_TIME,
-    createdAt,
     id: v4(),
     isLabelSyncedWithName: false,
     isUnique: false,
     objectMetadataId,
     uniqueIdentifier: BASE_OBJECT_STANDARD_FIELD_IDS.createdAt,
-    updatedAt: createdAt,
     workspaceId,
     standardId: BASE_OBJECT_STANDARD_FIELD_IDS.createdAt,
     name: 'createdAt',
@@ -219,13 +211,11 @@ export const buildDefaultFlatFieldMetadataForCustomObject = ({
 
   const updatedAtField: FlatFieldMetadata<FieldMetadataType.DATE_TIME> = {
     type: FieldMetadataType.DATE_TIME,
-    createdAt,
     id: v4(),
     isLabelSyncedWithName: false,
     isUnique: false,
     objectMetadataId,
     uniqueIdentifier: BASE_OBJECT_STANDARD_FIELD_IDS.updatedAt,
-    updatedAt: createdAt,
     workspaceId,
     standardId: BASE_OBJECT_STANDARD_FIELD_IDS.updatedAt,
     name: 'updatedAt',
@@ -249,13 +239,11 @@ export const buildDefaultFlatFieldMetadataForCustomObject = ({
 
   const deletedAtField: FlatFieldMetadata<FieldMetadataType.DATE_TIME> = {
     type: FieldMetadataType.DATE_TIME,
-    createdAt,
     id: v4(),
     isLabelSyncedWithName: false,
     isUnique: false,
     objectMetadataId,
     uniqueIdentifier: BASE_OBJECT_STANDARD_FIELD_IDS.deletedAt,
-    updatedAt: createdAt,
     workspaceId,
     standardId: BASE_OBJECT_STANDARD_FIELD_IDS.deletedAt,
     name: 'deletedAt',
@@ -279,13 +267,11 @@ export const buildDefaultFlatFieldMetadataForCustomObject = ({
 
   const createdByField: FlatFieldMetadata<FieldMetadataType.ACTOR> = {
     type: FieldMetadataType.ACTOR,
-    createdAt,
     id: v4(),
     isLabelSyncedWithName: false,
     isUnique: false,
     objectMetadataId,
     uniqueIdentifier: CUSTOM_OBJECT_STANDARD_FIELD_IDS.createdBy,
-    updatedAt: createdAt,
     workspaceId,
     standardId: CUSTOM_OBJECT_STANDARD_FIELD_IDS.createdBy,
     name: 'createdBy',
@@ -309,13 +295,11 @@ export const buildDefaultFlatFieldMetadataForCustomObject = ({
 
   const positionField: FlatFieldMetadata<FieldMetadataType.POSITION> = {
     type: FieldMetadataType.POSITION,
-    createdAt,
     id: v4(),
     isLabelSyncedWithName: false,
     isUnique: false,
     objectMetadataId,
     uniqueIdentifier: CUSTOM_OBJECT_STANDARD_FIELD_IDS.position,
-    updatedAt: createdAt,
     workspaceId,
     standardId: CUSTOM_OBJECT_STANDARD_FIELD_IDS.position,
     name: 'position',