add routes to get all albums and artists with sort

+ rewrite load all albums + artist logic with itertools.groupby
+ add a function to convert seconds to string

app/lib/albumslib.py

@@ -4,14 +4,41 @@ Contains methods relating to albums.
 
 from dataclasses import asdict
 from typing import Any
+from itertools import groupby
 
 
-from app.logger import log
 from app.models.track import Track
 from app.store.albums import AlbumStore
 from app.store.tracks import TrackStore
 
 
+def create_albums():
+    """
+    Creates albums from the tracks in the store.
+    """
+    
+    # group all tracks by albumhash
+    tracks = TrackStore.tracks
+    tracks = sorted(tracks, key=lambda t: t.albumhash)
+    grouped = groupby(tracks, lambda t: t.albumhash)
+
+    # create albums from the groups
+    albums: list[Track] = []
+    for albumhash, tracks in grouped:
+        count = len(list(tracks))
+        duration = sum(t.duration for t in tracks)
+        created_date = min(t.created_date for t in tracks)
+
+        album = AlbumStore.create_album(list(tracks)[0])
+        album.set_count(count)
+        album.set_duration(duration)
+        album.set_created_date(created_date)
+
+        albums.append(album)
+
+    return albums
+
+
 def validate_albums():
     """
     Removes albums that have no tracks.