Simplify Paginated Requests to ChurchTools api

[bensteUEM]

with 4f0c69c#diff-acbc88bf53d482b4a6ec290d435991157ef0ccebcf935ea28657667e05711af6R15

ef combine_paginated_response_data( self, response_content: dict, url: str, **kwargs ) -> dict:

was implemented and used for resources.
Other requests implement a similar code - e.g. get songs

• scan all code for "pagination" parts and simplify usage with inheritance

Might resolve #98