feat(plugins): implement plugin loading and management system

- Added PluginLoader component to dynamically load and initialize plugins.
- Created Plugins component for managing installed and marketplace plugins.
- Introduced PluginAPI for plugin interaction and settings management.
- Defined types for plugin metadata, installed plugins, and plugin index.
- Implemented settings rendering for plugins based on their schema.
- Integrated marketplace plugin fetching and installation logic.
- Added support for enabling/disabling and uninstalling plugins.

src/colors.css.ts

@@ -721,3 +721,4 @@ export const catppuccinMochaTheme = createTheme(color, {
     Overlay: 'rgba(0, 0, 0, 0.8)',
   },
 });
+