refactor(metadata): move cover resolution to extensions

test/models_and_utils_test.dart

@@ -864,7 +864,6 @@ void main() {
         embedMetadata: false,
         artistTagMode: artistTagModeSplitVorbis,
         embedLyrics: false,
-        embedMaxQualityCover: false,
         embedReplayGain: true,
         postProcessingEnabled: true,
         tidalHighFormat: 'opus_256',
@@ -924,7 +923,6 @@ void main() {
         'embed_metadata': false,
         'artist_tag_mode': artistTagModeSplitVorbis,
         'embed_lyrics': false,
-        'embed_max_quality_cover': false,
         'embed_replaygain': true,
         'post_processing_enabled': true,
         'tidal_high_format': 'opus_256',