playlist_add_items() to accept only full URIs and URLs (#914)

* updated functionality of playlist_add_items() to accept only uris and urls (ids should not be allowed since 'track' or 'episode' cannot be inferred purely from the id)

* added a check to raise runtime error if any items in playlist_add_items() are not URIs or URLs

* modified change log

* CL format fix

---------

Co-authored-by: Stéphane Bruckert <stephane.bruckert@gmail.com>

tests/integration/user_endpoints/test.py

@@ -47,6 +47,14 @@ class SpotipyPlaylistApiTest(unittest.TestCase):
             "spotify:episode:7cRcsGYYRUFo1OF3RgRzdx",
         ]
 
+        cls.tracks_and_episodes = [
+            "spotify:track:3F5CgOj3wFlRv51JsHbxhe",
+            "http://open.spotify.com/track/5mCPDVBb16L4XQwDdbRUpz",
+
+            "spotify:episode:7AY0yaj2k0W3obOSCfm6m4",
+            "https://open.spotify.com/episode/5AJB2BTp7RExSGpbQlIsXI"
+        ]
+
         scope = (
             'playlist-modify-public '
             'user-library-read '
@@ -112,7 +120,7 @@ class SpotipyPlaylistApiTest(unittest.TestCase):
     def test_playlist_replace_items(self):
         # add tracks to playlist
         self.spotify.playlist_add_items(
-            self.new_playlist['id'], self.four_tracks)
+            self.new_playlist['id'], self.tracks_and_episodes)
         playlist = self.spotify.playlist(self.new_playlist['id'])
         self.assertEqual(playlist['tracks']['total'], 4)
         self.assertEqual(len(playlist['tracks']['items']), 4)