attemp to add kwards to rc.ObservationData.from_nc

[TC-FF]

Pull Request Checklist:

• This PR addresses an already opened issue (for bug fixes / features)
  • This PR fixes #xyz
• (If applicable) Documentation has been added / updated (for bug fixes / features).
• (If applicable) Tests have been added.
• CHANGELOG.rst has been updated (with summary of main changes).
  • Link to issue (:issue:number) and pull request (:pull:number) has been added.

What kind of change does this PR introduce?

• ...

Does this PR introduce a breaking change?

Other information:

[Zeitsperre]

This signature creates a mutable default argument, meaning that multiple instances of the RavenPyModel running in the same script could inherit changes to this argument on prior initialisation. See: https://docs.python-guide.org/writing/gotchas/#mutable-default-arguments

Another way to do this would be

Suggested change

	hydro_station_properties={},
	hydro_station_properties: dict | None = None,

Followed by:

if hydro_station_properties is None:
    hydro_station_properties = {}