use cursor instead of offset based pagination

[karlicoss]

https://github.com/plamere/spotipy/issues/652#issuecomment-901364283

Didn't know it supported cursor pagination, should use this for 'as_list' method

    page = api_method(limit=50)

    res: List[Json] = page['items']
    while page['next']:
        page = spotipy.next(page)
        res.extend(page['items'])
    return res