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/utils/live-provider.test.ts

@@ -3,6 +3,7 @@ import { beforeEach, describe, expect, it, vi } from 'vitest';
 import * as go2rtcAudio from '../../src/camera-manager/utils/go2rtc/audio';
 import {
   getResolvedLiveProvider,
+  isGo2RTCLiveProvider,
   liveProviderSupports2WayAudio,
 } from '../../src/utils/live-provider';
 import { createCameraConfig, createHASS } from '../test-utils';
@@ -66,6 +67,20 @@ describe('live-provider utils', () => {
     });
   });
 
+  describe('isGo2RTCLiveProvider', () => {
+    it('should return true for go2rtc', () => {
+      expect(isGo2RTCLiveProvider('go2rtc')).toBe(true);
+    });
+
+    it('should return true for go2rtc-experimental', () => {
+      expect(isGo2RTCLiveProvider('go2rtc-experimental')).toBe(true);
+    });
+
+    it('should return false for other providers', () => {
+      expect(isGo2RTCLiveProvider('ha')).toBe(false);
+    });
+  });
+
   describe('liveProviderSupports2WayAudio', () => {
     it('should return false if resolved provider is not go2rtc', async () => {
       const config = createCameraConfig({
@@ -101,6 +116,21 @@ describe('live-provider utils', () => {
       );
     });
 
+    it('should support 2-way audio for the experimental provider', async () => {
+      const config = createCameraConfig({
+        live_provider: 'go2rtc-experimental',
+      });
+      const hass = createHASS();
+      vi.mocked(go2rtcAudio.supports2WayAudio).mockResolvedValue(true);
+
+      const result = await liveProviderSupports2WayAudio(
+        hass,
+        config,
+        config.go2rtc.metadata_fetch_timeout_seconds,
+      );
+      expect(result).toBe(true);
+    });
+
     it('should pass metadata fetch timeout through to go2rtc detection', async () => {
       const config = createCameraConfig({
         live_provider: 'go2rtc',