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/components/specs/SidemenuIcon.spec.js

@@ -1,10 +1,29 @@
 import { shallowMount } from '@vue/test-utils';
+import { createStore } from 'vuex';
 import SidemenuIcon from '../SidemenuIcon.vue';
 
+const store = createStore({
+  modules: {
+    auth: {
+      namespaced: false,
+      getters: {
+        getCurrentAccountId: () => 1,
+      },
+    },
+    accounts: {
+      namespaced: true,
+      getters: {
+        isFeatureEnabledonAccount: () => () => false,
+      },
+    },
+  },
+});
+
 describe('SidemenuIcon', () => {
   test('matches snapshot', () => {
     const wrapper = shallowMount(SidemenuIcon, {
       stubs: { WootButton: { template: '<button><slot /></button>' } },
+      global: { plugins: [store] },
     });
     expect(wrapper.vm).toBeTruthy();
     expect(wrapper.element).toMatchSnapshot();