feat(plugin): support enterprise extension (#861)

electron/extensions/index.ts

@@ -0,0 +1,17 @@
+export { extensionRegistry } from './registry';
+export { registerBuiltinExtension, loadExtensionsFromManifest } from './loader';
+export type {
+  Extension,
+  ExtensionContext,
+  HostApiRouteExtension,
+  MarketplaceProviderExtension,
+  MarketplaceCapability,
+  AuthProviderExtension,
+  AuthStatus,
+  RouteHandler,
+} from './types';
+export {
+  isHostApiRouteExtension,
+  isMarketplaceProviderExtension,
+  isAuthProviderExtension,
+} from './types';