feat(server): accepted video containers (#11274)

* add accepted container config

* update api

* mp4 option makes no sense

* add to transcoding settings

* wording

* updated spec config

* formatting

mobile/openapi/lib/api_client.dart

@@ -584,6 +584,8 @@ class ApiClient {
           return ValidateLibraryResponseDto.fromJson(value);
         case 'VideoCodec':
           return VideoCodecTypeTransformer().decode(value);
+        case 'VideoContainer':
+          return VideoContainerTypeTransformer().decode(value);
         default:
           dynamic match;
           if (value is List && (match = _regList.firstMatch(targetType)?.group(1)) != null) {