feat(fetcher): add data fetcher

app/fetcher/__init__.py

@@ -0,0 +1,10 @@
+from __future__ import annotations
+
+from .beatmap import BeatmapFetcher
+from .beatmapset import BeatmapsetFetcher
+
+
+class Fetcher(BeatmapFetcher, BeatmapsetFetcher):
+    """A class that combines all fetchers for easy access."""
+
+    pass