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/app/pages/client/ClientRoot.tsx

@@ -28,6 +28,7 @@ import { ServerConfigsLoader } from '../../components/ServerConfigsLoader';
 import { CapabilitiesProvider } from '../../hooks/useCapabilities';
 import { MediaConfigProvider } from '../../hooks/useMediaConfig';
 import { MatrixClientProvider } from '../../hooks/useMatrixClient';
+import { PluginLoader } from '../../features/settings/plugins';
 import { SpecVersions } from './SpecVersions';
 import { AsyncStatus, useAsyncCallback } from '../../hooks/useAsyncCallback';
 import { useSyncState } from '../../hooks/useSyncState';
@@ -284,19 +285,21 @@ export function ClientRoot({ children }: ClientRootProps) {
         <ClientRootLoading />
       ) : (
         <MatrixClientProvider value={mx}>
-          <CallProviderWrapper>
-            <ServerConfigsLoader>
-              {(serverConfigs) => (
-                <CapabilitiesProvider value={serverConfigs.capabilities ?? {}}>
-                  <MediaConfigProvider value={serverConfigs.mediaConfig ?? {}}>
-                    <AuthMetadataProvider value={serverConfigs.authMetadata}>
-                      {children}
-                    </AuthMetadataProvider>
-                  </MediaConfigProvider>
-                </CapabilitiesProvider>
-              )}
-            </ServerConfigsLoader>
-          </CallProviderWrapper>
+          <PluginLoader matrixClient={mx}>
+            <CallProviderWrapper>
+              <ServerConfigsLoader>
+                {(serverConfigs) => (
+                  <CapabilitiesProvider value={serverConfigs.capabilities ?? {}}>
+                    <MediaConfigProvider value={serverConfigs.mediaConfig ?? {}}>
+                      <AuthMetadataProvider value={serverConfigs.authMetadata}>
+                        {children}
+                      </AuthMetadataProvider>
+                    </MediaConfigProvider>
+                  </CapabilitiesProvider>
+                )}
+              </ServerConfigsLoader>
+            </CallProviderWrapper>
+          </PluginLoader>
         </MatrixClientProvider>
       )}
     </SpecVersions>