1750 extensibility twenty sdk v2 use twenty sdk to define an object (#15230)

We maintain jsonc object definition but will deprecate them pretty soon

## Before
<img width="1512" height="575" alt="image"
src="https://github.com/user-attachments/assets/d2fa6ca4-c456-4aa9-a1e3-845b61839718"
/>

## After
<img width="1260" height="555" alt="image"
src="https://github.com/user-attachments/assets/ba72f4cf-d443-4967-913c-029bc71f3f48"
/>

packages/twenty-sdk/src/decorators/index.ts

@@ -1,2 +1 @@
-export { };
-
+export { ObjectMetadata } from './object-metadata.decorator';

packages/twenty-sdk/src/decorators/object-metadata.decorator.ts

@@ -0,0 +1,13 @@
+type ObjectMetadataOptions = {
+  universalIdentifier: string;
+  nameSingular: string;
+  namePlural: string;
+  labelSingular: string;
+  labelPlural: string;
+  description?: string;
+  icon?: string;
+};
+
+export const ObjectMetadata = (_: ObjectMetadataOptions): ClassDecorator => {
+  return () => {};
+};

packages/twenty-sdk/src/index.ts

@@ -1,2 +1 @@
 export * from './decorators';
-export * from './types';

packages/twenty-sdk/src/types/index.ts

@@ -1 +0,0 @@
-export { };