Lots of fixes for track management

src/musicbrainz.rs

@@ -119,4 +119,22 @@ impl SearchProvider for MusicBrainzSearch {
                 .collect(),
         })
     }
+
+    async fn get_release_groups(
+        &self,
+        artist_id: &str,
+    ) -> SearchResult<Vec<crate::provider::ReleaseGroupResult>> {
+        let groups = self.client.get_artist_release_groups(artist_id).await?;
+        Ok(groups
+            .into_iter()
+            .map(|rg| crate::provider::ReleaseGroupResult {
+                id: rg.mbid,
+                title: rg.title,
+                primary_type: rg.primary_type,
+                secondary_types: rg.secondary_types,
+                first_release_date: rg.first_release_date,
+                first_release_id: rg.first_release_mbid,
+            })
+            .collect())
+    }
 }