fiexed bug in produce data manyStations

split into usage of optional parameters and an example without a restriction, that will run for several days.

toar_rest_client: continued work on error handling.

enabled execution with additional query parameters

uncommented some debug output
update to dropping of timestamps that is required for some datasets...

added some error handling when using a cahced endpoint

under development

also added some handling in case of the request to the TAOR DB fails

removed extraction of a single day from benchmark -> seems to cause
crashes.

added output directories of benchmark script to ignore

removed manual creation of request from get_sample_data.ipynb
this is handled in a different example (get_sample_data_manual.ipynb)

added documentation

-changed sampling from daily to monthly
-fixed Metadata.construct parameter order

toar_rest_client: DownloadAnalysisService:
-added CF name of variable to sample file name

fixed typos and added some documentation

In dataclass attributes with an explicit setter to restrict the valid parameters are treated as having a default value by python

changed constructor of MetaData

now new notebook for obtaining sample data is running
added old version as example how a request can be generated manual

worked on documentation of code