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/providers/go2rtc-experimental/adapters/peer-connection.test.ts

@@ -0,0 +1,29 @@
+import { describe, expect, it, vi } from 'vitest';
+
+import {
+  createBrowserPeerConnection,
+  GO2RTC_PEER_CONNECTION_CONFIG,
+} from '../../../../../../src/components-lib/live/providers/go2rtc-experimental/adapters/peer-connection';
+
+describe('peer-connection', () => {
+  it('should configure two STUN servers with max-bundle', () => {
+    expect(GO2RTC_PEER_CONNECTION_CONFIG).toEqual({
+      bundlePolicy: 'max-bundle',
+      iceServers: [
+        {
+          urls: ['stun:stun.l.google.com:19302', 'stun:stun.cloudflare.com:3478'],
+        },
+      ],
+    });
+  });
+
+  it('should construct a real peer connection', () => {
+    const RTCPeerConnectionMock = vi.fn();
+    vi.stubGlobal('RTCPeerConnection', RTCPeerConnectionMock);
+
+    createBrowserPeerConnection(GO2RTC_PEER_CONNECTION_CONFIG);
+
+    expect(RTCPeerConnectionMock).toHaveBeenCalledWith(GO2RTC_PEER_CONNECTION_CONFIG);
+    vi.unstubAllGlobals();
+  });
+});