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/flat-object-metadata/utils/compare-two-flat-object-metadata.util.ts

@@ -23,7 +23,7 @@ export type FlatObjectMetadataPropertiesToCompare =
   (typeof flatObjectMetadataPropertiesToCompare)[number];
 
 /**
- * This comparator handles update on colliding uniqueIdentifier flatObjectdMetadata
+ * This comparator handles update on colliding uniqueIdentifier flatObjectMetadata
  */
 export const compareTwoFlatObjectMetadata = ({
   from,

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata/utils/from-create-object-input-to-flat-object-metadata.util.ts

@@ -0,0 +1,69 @@
+import { trimAndRemoveDuplicatedWhitespacesFromObjectStringProperties } from 'twenty-shared/utils';
+import { v4 } from 'uuid';
+
+import { FlatObjectMetadata } from 'src/engine/metadata-modules/flat-object-metadata/types/flat-object-metadata.type';
+import { CreateObjectInput } from 'src/engine/metadata-modules/object-metadata/dtos/create-object.input';
+import {
+  ObjectMetadataException,
+  ObjectMetadataExceptionCode,
+} from 'src/engine/metadata-modules/object-metadata/object-metadata.exception';
+import { buildDefaultFlatFieldMetadataForCustomObject } from 'src/engine/metadata-modules/object-metadata/utils/build-default-fields-for-custom-object.util';
+
+export const fromCreateObjectInputToFlatObjectMetadata = (
+  rawCreateObjectInput: CreateObjectInput,
+): FlatObjectMetadata => {
+  if (rawCreateObjectInput.isRemote) {
+    throw new ObjectMetadataException(
+      'Remote objects are not supported',
+      ObjectMetadataExceptionCode.INVALID_OBJECT_INPUT,
+    );
+  }
+
+  const createObjectInput =
+    trimAndRemoveDuplicatedWhitespacesFromObjectStringProperties(
+      rawCreateObjectInput,
+      [
+        'description',
+        'icon',
+        'labelPlural',
+        'labelSingular',
+        'namePlural',
+        'nameSingular',
+        'shortcut',
+      ],
+    );
+
+  const objectMetadataId = v4();
+  const baseCustomFlatFieldMetadatas =
+    buildDefaultFlatFieldMetadataForCustomObject({
+      objectMetadataId,
+      workspaceId: createObjectInput.workspaceId,
+    });
+
+  return {
+    description: createObjectInput.description ?? null,
+    flatFieldMetadatas: Object.values(baseCustomFlatFieldMetadatas),
+    flatIndexMetadatas: [],
+    icon: createObjectInput.icon ?? null,
+    id: objectMetadataId,
+    imageIdentifierFieldMetadataId: null,
+    isActive: true,
+    isAuditLogged: true,
+    isCustom: true,
+    isLabelSyncedWithName: createObjectInput.isLabelSyncedWithName ?? false,
+    isRemote: false,
+    isSearchable: true,
+    isSystem: false,
+    labelIdentifierFieldMetadataId: baseCustomFlatFieldMetadatas.nameField.id,
+    labelPlural: createObjectInput.labelPlural ?? null,
+    labelSingular: createObjectInput.labelSingular ?? null,
+    namePlural: createObjectInput.namePlural ?? null,
+    nameSingular: createObjectInput.nameSingular ?? null,
+    shortcut: createObjectInput.shortcut ?? null,
+    standardId: null,
+    standardOverrides: null,
+    uniqueIdentifier: objectMetadataId,
+    targetTableName: 'DEPRECATED',
+    workspaceId: createObjectInput.workspaceId,
+  };
+};

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata/utils/merge-two-flat-object-metadatas.util.ts

@@ -8,7 +8,7 @@ import { mergeTwoFlatFieldMetadatas } from 'src/engine/metadata-modules/flat-fie
 import { FlatObjectMetadata } from 'src/engine/metadata-modules/flat-object-metadata/types/flat-object-metadata.type';
 import { ToMerge } from 'src/engine/workspace-manager/workspace-migration-v2/workspace-migration-builder-v2/types/to-merge.type';
 
-export const mergeTwoFlatFieldObjectMetadatas = ({
+export const mergeTwoFlatObjectMetadatas = ({
   destFlatObjectMetadatas,
   toMergeFlatObjectMetadatas,
 }: ToMerge<FlatObjectMetadata[], 'object'>): FlatObjectMetadata[] => {