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/utils/live-edge-tracker/test-utils.ts

@@ -0,0 +1,10 @@
+export const createStatus = (
+  bufferedEndSeconds: number,
+  currentTimeSeconds: number,
+  options?: { playbackRate?: number; now?: Date },
+) => ({
+  bufferedEndSeconds,
+  currentTimeSeconds,
+  playbackRate: options?.playbackRate ?? 1,
+  now: options?.now ?? new Date(0),
+});