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`.

src/localize/languages/de.json

@@ -382,7 +382,6 @@
     "awaiting_media": "Warte auf Medium ...",
     "camera_initialization": "Kamera-Initialisierung fehlgeschlagen",
     "camera_initialization_reolink": "Konnte Reolink-Kamera nicht initialisieren",
-    "configuration": "Konfiguration überprüfen",
     "duplicate_folder_id": "Doppelte Ordner-ID für den folgen Ordner, benutzte Parameter 'id' um Ordner eindeutig zu identifizieren",
     "failed_proxy": "Konnte mich nicht über Home Assistant verbinden",
     "fetching_diagnostics": "Rufe Diagnosedaten ab",

src/localize/languages/en.json

@@ -141,6 +141,7 @@
       "live_providers": {
         "auto": "Automatic",
         "go2rtc": "go2rtc",
+        "go2rtc-experimental": "go2rtc (experimental implementation)",
         "ha": "Home Assistant video stream (i.e. HLS, LL-HLS, WebRTC via HA)",
         "image": "Image",
         "jsmpeg": "JSMpeg",
@@ -781,7 +782,7 @@
     "call_no_two_way_audio": "This camera does not support two-way audio.",
     "camera_initialization": "Camera initialization failed",
     "camera_initialization_reolink": "Could not initialize Reolink camera",
-    "configuration": "Check configuration",
+    "configuration_error": "Configuration error",
     "could_not_create_elements": "Could not create picture elements",
     "diagnostics": "Card diagnostics. Please review for confidential information prior to sharing",
     "download_failed": "Download failed",
@@ -866,7 +867,10 @@
         "entity_unavailable": "Camera entity unavailable",
         "not_loading": "Media not loading",
         "playback_error": "Playback error",
-        "stalled": "Stream stalled"
+        "server_error": "Streaming server error",
+        "stalled": "Stream stalled",
+        "two_way_audio_error": "Two-way audio error",
+        "unsupported": "Stream not supported"
       },
       "text": "The media is not currently available. This can happen for several reasons, for example a camera becoming unavailable, a stream stalling or failing, or media that has not finished loading. The card keeps retrying automatically. For live views, a still image may be shown while a stream is loading (if configured, and by default)"
     },

src/localize/languages/pl.json

@@ -654,7 +654,6 @@
     "awaiting_media": "Oczekiwanie na załadowanie mediów",
     "camera_initialization": "Inicjalizacja kamery nie powiodła się",
     "camera_initialization_reolink": "Nie można zainicjować kamery Reolink",
-    "configuration": "Sprawdź konfigurację",
     "could_not_create_elements": "Nie można wyrenderować elementów obrazu",
     "diagnostics": "Diagnostyka karty. Przejrzyj pod kątem poufnych informacji przed udostępnieniem",
     "download_no_media": "Brak mediów do pobrania",