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/api/getall/__init__.py

@@ -0,0 +1,10 @@
+from flask import Blueprint
+from flask_restful import Api
+
+from .resources import Albums
+
+api_bp = Blueprint("getall", __name__, url_prefix="/getall")
+api = Api(api_bp)
+
+
+api.add_resource(Albums, "/<itemtype>")