Improvement of current handling of monitoring

[eileen-kuehn]

As mentioned in MatterMiners/lapis.caching#20, we currently have the issue that classes must be subclassed to enable further monitoring which prevents transparent further development of the base components, e.g. in the caching extension the Workernode needs to be subclassed to enable logging of caching relevant information during methods such as shutdown:

https://github.com/MatterMiners/lapis.caching/blob/8f4f6149dc536f9d35dfc7c97ce75e0c204a1512/lapis/drone.py#L124-L131