Fix bundled extensions not being loaded (#7359)

* Fix bundled extensions not being loaded

- Also show that this fixes it by added an example bundled
  extension to 'open-lens'

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Fix build

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* Add explanatory comment for inline require

Signed-off-by: Sebastian Malton <sebastian@malton.name>

---------

Signed-off-by: Sebastian Malton <sebastian@malton.name>

packages/core/src/extensions/lens-extension.ts

@@ -3,35 +3,12 @@
  * Licensed under MIT License. See LICENSE in root directory for more information.
  */
 
-import type { InstalledExtension } from "./extension-discovery/extension-discovery";
 import { action, computed, makeObservable, observable } from "mobx";
-import type { PackageJson } from "type-fest";
 import { disposer } from "@k8slens/utilities";
 import type { LensExtensionDependencies } from "./lens-extension-set-dependencies";
 import type { ProtocolHandlerRegistration } from "../common/protocol-handler/registration";
+import type { InstalledExtension, LegacyLensExtension, LensExtensionId, LensExtensionManifest } from "@k8slens/legacy-extensions";
 
-export type LensExtensionId = string; // path to manifest (package.json)
-export type LensExtensionConstructor = new (...args: ConstructorParameters<typeof LensExtension>) => LensExtension;
-
-export interface LensExtensionManifest extends PackageJson {
-  name: string;
-  version: string;
-  main?: string; // path to %ext/dist/main.js
-  renderer?: string; // path to %ext/dist/renderer.js
-  /**
-   * Supported Lens version engine by extension could be defined in `manifest.engines.lens`
-   * Only MAJOR.MINOR version is taken in consideration.
-   */
-  engines: {
-    lens: string; // "semver"-package format
-    npm?: string;
-    node?: string;
-  };
-
-  // Specify extension name used for persisting data.
-  // Useful if extension is renamed but the data should not be lost.
-  storeName?: string;
-}
 
 export const lensExtensionDependencies = Symbol("lens-extension-dependencies");
 export const Disposers = Symbol("disposers");
@@ -41,7 +18,7 @@ export class LensExtension<
    * @ignore
    */
   Dependencies extends LensExtensionDependencies = LensExtensionDependencies,
-> {
+> implements LegacyLensExtension {
   readonly id: LensExtensionId;
   readonly manifest: LensExtensionManifest;
   readonly manifestPath: string;