feat: Add experimental rewrite of go2rtc live provider (MSE/WebRTC/MP4/MJPEG) (#2580)

- Closes #2556
- Closes #2450

**Key intended features:**
 - go2rtc compatible
- 100% test coverage to significantly improve ability to test, maintain
and work around browser weirdnesses (e.g. Safari).
 - Written from the ground up in the style of the rest of the project.

**To use:**
 - Change `live_provider` from `go2rtc` to `go2rtc-experimental`.

tests/components-lib/live/utils/dispatch-live-error.test.ts

@@ -11,3 +11,14 @@ it('should dispatch live error event', () => {
   dispatchLiveErrorEvent(element);
   expect(handler).toBeCalled();
 });
+
+it('should forward the reason as the event detail', () => {
+  const element = document.createElement('div');
+  const handler = vi.fn();
+  element.addEventListener('advanced-camera-card:live:error', handler);
+
+  dispatchLiveErrorEvent(element, 'unsupported');
+  expect(handler).toHaveBeenCalledWith(
+    expect.objectContaining({ detail: 'unsupported' }),
+  );
+});