refactor: remove logging in algorithms

algo/common/common.go

@@ -1,14 +1,19 @@
 package common
 
+import "context"
+
 type Decoder interface {
 	Validate() error
 	Decode() error
-	GetCoverImage() []byte
 	GetAudioData() []byte
 	GetAudioExt() string
 	GetMeta() Meta
 }
 
+type CoverImageGetter interface {
+	GetCoverImage(ctx context.Context) ([]byte, error)
+}
+
 type Meta interface {
 	GetArtists() []string
 	GetTitle() string

algo/common/raw.go

@@ -28,10 +28,6 @@ func (d RawDecoder) Decode() error {
 	return nil
 }
 
-func (d RawDecoder) GetCoverImage() []byte {
-	return nil
-}
-
 func (d RawDecoder) GetAudioData() []byte {
 	return d.file
 }