feat(server): transcoding hardware acceleration (#3171)

* added transcode configs for nvenc,qsv and vaapi

* updated dev docker compose

* added software fallback

* working vaapi

* minor fixes and added tests

* updated api

* compile libvips

* move hwaccel settings to `hwaccel.yml`

* changed default dockerfile, moved `readdir` call

* removed unused import

* minor cleanup

* fix for arm build

* added documentation, minor fixes

* added intel driver

* updated docs

styling

* uppercase codec and api names

* formatting

* added tests

* updated docs

* removed semicolons

* added link to `hwaccel.yml`

* added newlines

* added `hwaccel` section to docker-compose.prod.yml

* ensure mesa drivers are installed

* switch to mimalloc for sharp

* moved build version and sha256 to json

* let libmfx set the render device

* possible fix for vp9 on qsv

* updated tests

* formatting

* review suggestions

* semicolon

* moved `LD_PRELOAD` to start script

* switched to jellyfin's ffmpeg package

* fixed dockerfile

* use cqp instead of icq for qsv vp9

* updated dockerfile

* added sha256sum for other platforms

* fixtures

mobile/openapi/lib/api_helper.dart

@@ -82,6 +82,9 @@ String parameterToString(dynamic value) {
   if (value is TimeGroupEnum) {
     return TimeGroupEnumTypeTransformer().encode(value).toString();
   }
+  if (value is TranscodeHWAccel) {
+    return TranscodeHWAccelTypeTransformer().encode(value).toString();
+  }
   if (value is TranscodePolicy) {
     return TranscodePolicyTypeTransformer().encode(value).toString();
   }