feat: view groups (#7176)

Fix #4244 and #4356

This pull request introduces the new "view groups" capability, enabling
the reordering, hiding, and showing of columns in Kanban mode. The core
enhancement includes the addition of a new entity named `ViewGroup`,
which manages column behaviors and interactions.

#### Key Changes:
1. **ViewGroup Entity**:  
The newly added `ViewGroup` entity is responsible for handling the
organization and state of columns.
This includes:
   - The ability to reorder columns.
- The option to hide or show specific columns based on user preferences.

#### Conclusion:
This PR adds a significant new feature that enhances the flexibility of
Kanban views through the `ViewGroup` entity.
We'll later add the view group logic to table view too.

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-server/src/modules/view/standard-objects/view.workspace-entity.ts

@@ -18,6 +18,7 @@ import { FavoriteWorkspaceEntity } from 'src/modules/favorite/standard-objects/f
 import { ViewFieldWorkspaceEntity } from 'src/modules/view/standard-objects/view-field.workspace-entity';
 import { ViewFilterWorkspaceEntity } from 'src/modules/view/standard-objects/view-filter.workspace-entity';
 import { ViewSortWorkspaceEntity } from 'src/modules/view/standard-objects/view-sort.workspace-entity';
+import { ViewGroupWorkspaceEntity } from 'src/modules/view/standard-objects/view-group.workspace-entity';
 
 @WorkspaceEntity({
   standardId: STANDARD_OBJECT_IDS.view,
@@ -113,6 +114,18 @@ export class ViewWorkspaceEntity extends BaseWorkspaceEntity {
   @WorkspaceIsNullable()
   viewFields: Relation<ViewFieldWorkspaceEntity[]>;
 
+  @WorkspaceRelation({
+    standardId: VIEW_STANDARD_FIELD_IDS.viewGroups,
+    type: RelationMetadataType.ONE_TO_MANY,
+    label: 'View Groups',
+    description: 'View Groups',
+    icon: 'IconTag',
+    inverseSideTarget: () => ViewGroupWorkspaceEntity,
+    onDelete: RelationOnDeleteAction.SET_NULL,
+  })
+  @WorkspaceIsNullable()
+  viewGroups: Relation<ViewGroupWorkspaceEntity[]>;
+
   @WorkspaceRelation({
     standardId: VIEW_STANDARD_FIELD_IDS.viewFilters,
     type: RelationMetadataType.ONE_TO_MANY,