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/fixtures.js

@@ -1,3 +1,20 @@
+export const contactViewList = [
+  {
+    name: 'Custom view 1',
+    filter_type: 1,
+    query: {
+      payload: [
+        {
+          attribute_key: 'name',
+          filter_operator: 'equal_to',
+          values: ['john doe'],
+          query_operator: null,
+        },
+      ],
+    },
+  },
+];
+
 export const customViewList = [
   {
     name: 'Custom view',
@@ -21,14 +38,14 @@ export const customViewList = [
   },
   {
     name: 'Custom view 1',
-    filter_type: 1,
+    filter_type: 0,
     query: {
       payload: [
         {
-          attribute_key: 'name',
+          attribute_key: 'assignee_id',
           filter_operator: 'equal_to',
-          values: ['john doe'],
-          query_operator: null,
+          values: [45],
+          query_operator: 'and',
         },
       ],
     },