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/basic.test.ts

@@ -9,7 +9,6 @@ import {
   arrayMove,
   aspectRatioToStyle,
   contentsChanged,
-  convertHTTPAdressToWebsocket,
   dayToDate,
   desparsifyArrays,
   errorToConsole,
@@ -561,26 +560,6 @@ describe('ignoreFunctionIdentity', () => {
   });
 });
 
-describe('convertHTTPAdressToWebsocket', () => {
-  it('should convert http to ws', () => {
-    expect(convertHTTPAdressToWebsocket('http://example.com')).toBe('ws://example.com');
-  });
-  it('should convert https to ws', () => {
-    expect(convertHTTPAdressToWebsocket('https://example.com')).toBe(
-      'wss://example.com',
-    );
-  });
-  it('should not change ws url', () => {
-    expect(convertHTTPAdressToWebsocket('ws://example.com')).toBe('ws://example.com');
-  });
-  it('should not change wss url', () => {
-    expect(convertHTTPAdressToWebsocket('wss://example.com')).toBe('wss://example.com');
-  });
-  it('should handle mixed case', () => {
-    expect(convertHTTPAdressToWebsocket('HtTp://example.com')).toBe('ws://example.com');
-  });
-});
-
 describe('forceReflow', () => {
   it('should access offsetHeight to trigger reflow', () => {
     const element = document.createElement('div');