Improve performance twenty orm (#6691)

## Context

As we grow, the messaging scripts are experiencing performance issues
forcing us to temporarily disable them on the cloud.
While investigating the performance, I have noticed that generating the
entity schema (for twentyORM) in the repository is taking ~500ms locally
on my Mac M2 so likely more on pods. Caching the entitySchema then!

I'm also clarifying naming around schemaVersion and cacheVersions ==>
both are renamed workspaceMetadataVersion and migrated to the workspace
table (the workspaceCacheVersion table is dropped).

packages/twenty-server/@types/express.d.ts

@@ -8,6 +8,6 @@ declare module 'express-serve-static-core' {
     apiKey?: ApiKeyWorkspaceEntity | null;
     workspace?: Workspace;
     workspaceId?: string;
-    cacheVersion?: string | null;
+    workspaceMetadataVersion?: number;
   }
 }