feat: Add new sidebar for Chatwoot V4 (#10291)

This PR has the initial version of the new sidebar targeted for the next major redesign of the app. This PR includes the following changes

- Components in the `layouts-next` and `base-next` directories in `dashboard/components`
- Two generic components `Avatar` and `Icon`
- `SidebarGroup` component to manage expandable sidebar groups with nested navigation items. This includes handling active states, transitions, and permissions.
- `SidebarGroupHeader` component to display the header of each navigation group with optional icons and active state indication.
- `SidebarGroupLeaf` component for individual navigation items within a group, supporting icons and active state.
- `SidebarGroupSeparator` component to visually separate nested navigation items. (They look a lot like header)
- `SidebarGroupEmptyLeaf` component to render empty state of any navigation groups.

----

Co-authored-by: Pranav <pranav@chatwoot.com>
Co-authored-by: Pranav <pranavrajs@gmail.com>

app/javascript/dashboard/store/modules/specs/customViews/getters.spec.js

@@ -1,49 +1,9 @@
 import { getters } from '../../customViews';
-import { customViewList } from './fixtures';
+import { contactViewList, customViewList } from './fixtures';
 
 describe('#getters', () => {
-  it('getCustomViews', () => {
-    const state = { records: customViewList };
-    expect(getters.getCustomViews(state)).toEqual([
-      {
-        name: 'Custom view',
-        filter_type: 0,
-        query: {
-          payload: [
-            {
-              attribute_key: 'assignee_id',
-              filter_operator: 'equal_to',
-              values: [45],
-              query_operator: 'and',
-            },
-            {
-              attribute_key: 'inbox_id',
-              filter_operator: 'equal_to',
-              values: [144],
-              query_operator: 'and',
-            },
-          ],
-        },
-      },
-      {
-        name: 'Custom view 1',
-        filter_type: 1,
-        query: {
-          payload: [
-            {
-              attribute_key: 'name',
-              filter_operator: 'equal_to',
-              values: ['john doe'],
-              query_operator: null,
-            },
-          ],
-        },
-      },
-    ]);
-  });
-
   it('getCustomViewsByFilterType', () => {
-    const state = { records: customViewList };
+    const state = { contact: { records: contactViewList } };
     expect(getters.getCustomViewsByFilterType(state)(1)).toEqual([
       {
         name: 'Custom view 1',