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>

vite.config.ts

@@ -75,6 +75,7 @@ export default defineConfig({
     alias: {
       vue: 'vue/dist/vue.esm-bundler.js',
       components: path.resolve('./app/javascript/dashboard/components'),
+      next: path.resolve('./app/javascript/dashboard/components-next'),
       v3: path.resolve('./app/javascript/v3'),
       dashboard: path.resolve('./app/javascript/dashboard'),
       helpers: path.resolve('./app/javascript/shared/helpers'),