Do not use temporary cache in Redmine\Api\...::list() methods

[Art4]

The call of the new list() methods from #329 will change the cache thats also used in the listing() methods. See #338.

We should remove the change of the cache from the list() methods and move it back in the all() and listing() methods for BC.

Instead of caching the results inside the \Redmine\Api\... classes we should use a PSR-6/PSR-16 cache implementation.