feat: manually implement joinColumn (#6022)

This PR introduce a new decorator named `@WorkspaceJoinColumn`, the goal
of this one is to manually declare the join columns inside the workspace
entities, so we don't have to rely on `ObjectRecord` type.

This decorator can be used that way:

```typescript
  @WorkspaceRelation({
    standardId: ACTIVITY_TARGET_STANDARD_FIELD_IDS.company,
    type: RelationMetadataType.MANY_TO_ONE,
    label: 'Company',
    description: 'ActivityTarget company',
    icon: 'IconBuildingSkyscraper',
    inverseSideTarget: () => CompanyWorkspaceEntity,
    inverseSideFieldKey: 'activityTargets',
  })
  @WorkspaceIsNullable()
  company: Relation<CompanyWorkspaceEntity> | null;

  // The argument is the name of the relation above
  @WorkspaceJoinColumn('company')
  companyId: string | null;
```

packages/twenty-server/src/engine/twenty-orm/interfaces/workspace-join-columns-metadata-args.interface.ts

@@ -0,0 +1,17 @@
+export interface WorkspaceJoinColumnsMetadataArgs {
+  /**
+   * Class to which relation is applied.
+   */
+  // eslint-disable-next-line @typescript-eslint/ban-types
+  readonly target: Function;
+
+  /**
+   * Relation name.
+   */
+  readonly relationName: string;
+
+  /**
+   * Relation label.
+   */
+  readonly joinColumn: string;
+}

packages/twenty-server/src/engine/twenty-orm/interfaces/workspace-relation-metadata-args.interface.ts

@@ -62,11 +62,6 @@ export interface WorkspaceRelationMetadataArgs {
    */
   readonly onDelete?: RelationOnDeleteAction;
 
-  /**
-   * Relation join column.
-   */
-  readonly joinColumn?: string;
-
   /**
    * Is primary field.
    */