Add GET /api/v1/statistics/soundtracks with every soundtrack and its songs

The other soundtrack statistics are capped at 100, so a client that shows every soundtrack (the MusicPlayer statistics tab) had no way to get them all. This one has no limit and is sorted by name.

internal/db/queries/statistics.sql

@@ -180,3 +180,30 @@ SELECT
     COALESCE(MIN(times_played), 0)::bigint as min_soundtrack_plays
 FROM soundtrack
 WHERE deleted IS NULL;
+
+-- Every soundtrack with its songs, by name
+-- name: GetAllSoundtracksWithSongs :many
+SELECT 
+    g.id as soundtrack_id,
+    g.uuid as soundtrack_uuid,
+    g.soundtrack_name,
+    g.times_played as soundtrack_played,
+    g.last_played as soundtrack_last_played,
+    COALESCE(
+        json_agg(
+            json_build_object(
+                'song_uuid', s.uuid,
+                'soundtrack_uuid', g.uuid,
+                'song_name', s.song_name,
+                'path', s.path,
+                'times_played', s.times_played,
+                'file_name', s.file_name
+            )
+        ) FILTER (WHERE s.uuid IS NOT NULL),
+        '[]'
+    )::json as songs
+FROM soundtrack g
+LEFT JOIN song s ON g.id = s.soundtrack_id
+WHERE g.deleted IS NULL
+GROUP BY g.id, g.soundtrack_name, g.times_played, g.last_played
+ORDER BY g.soundtrack_name;