Extensible welcome page (#2637)

* welcome/landing page

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

* fix integration tests

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/extensions/registries/index.ts

@@ -10,3 +10,4 @@ export * from "./kube-object-menu-registry";
 export * from "./kube-object-status-registry";
 export * from "./command-registry";
 export * from "./entity-setting-registry";
+export * from "./welcome-menu-registry";

src/extensions/registries/welcome-menu-registry.ts

@@ -0,0 +1,11 @@
+import { BaseRegistry } from "./base-registry";
+
+export interface WelcomeMenuRegistration {
+  title: string;
+  icon: string;
+  click: () => void | Promise<void>;
+}
+
+export class WelcomeMenuRegistry extends BaseRegistry<WelcomeMenuRegistration> {}
+
+export const welcomeMenuRegistry = new WelcomeMenuRegistry();