feat: ServiceWorkerMain (#45232)

* feat: ServiceWorkerMain

* refactor: disconnect remote

* handle version_info_ nullptr case

* initiate finish request when possible and enumerate errors

* explicit name for test method

* oops

* fix: wait for redundant version to stop before destroying

* docs: clarify when undefined is returned

* chore: remove extra semicolons

docs/api/service-worker-main.md

@@ -0,0 +1,34 @@
+# ServiceWorkerMain
+
+> An instance of a Service Worker representing a version of a script for a given scope.
+
+Process: [Main](../glossary.md#main-process)
+
+## Class: ServiceWorkerMain
+
+Process: [Main](../glossary.md#main-process)<br />
+_This class is not exported from the `'electron'` module. It is only available as a return value of other methods in the Electron API._
+
+### Instance Methods
+
+#### `serviceWorker.isDestroyed()` _Experimental_
+
+Returns `boolean` - Whether the service worker has been destroyed.
+
+#### `serviceWorker.startTask()` _Experimental_
+
+Returns `Object`:
+
+- `end` Function - Method to call when the task has ended. If never called, the service won't terminate while otherwise idle.
+
+Initiate a task to keep the service worker alive until ended.
+
+### Instance Properties
+
+#### `serviceWorker.scope` _Readonly_ _Experimental_
+
+A `string` representing the scope URL of the service worker.
+
+#### `serviceWorker.versionId` _Readonly_ _Experimental_
+
+A `number` representing the ID of the specific version of the service worker script in its scope.