Add universal identifier to view tables (#14139)

## Context
Introducing a new SyncableEntity abstraction that can be extended by
Entities that we want to "sync" via their universal identifier (the
class will add this uuid to the entity). Starting with views, will
refactor existing syncable entities such as objects/fields later

packages/twenty-server/src/engine/workspace-manager/workspace-sync/interfaces/syncable-entity.interface.ts

@@ -0,0 +1,9 @@
+import { Column, Index } from 'typeorm';
+
+@Index(['workspaceId', 'universalIdentifier'], {
+  unique: true,
+})
+export abstract class SyncableEntity {
+  @Column({ nullable: true, type: 'uuid' })
+  universalIdentifier?: string | null;
+}