Add support for token only authentication in db selection and check if credentials are valid.

[bergnerjonas]

1. Call the helloworld/logincheck endpoint when setting credentials to check if these credentials are valid. Also invoke this if the set_user/set_pw functions are called.
2. Only check if user was set when selecting the correct db to use.
3. Needed to switch from from x import y to import y in some cases to prevent circular import errors.

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[codecov]

Codecov Report

Attention: Patch coverage is 88.57143% with 4 lines in your changes missing coverage. Please review.

Project coverage is 81.41%. Comparing base (8191190) to head (c4ec57b).

Files with missing lines	Patch %	Lines
src/pystatis/db.py	84.21%	3 Missing ⚠️
src/pystatis/config.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #177      +/-   ##
==========================================
- Coverage   81.59%   81.41%   -0.18%     
==========================================
  Files          12       12              
  Lines         576      592      +16     
==========================================
+ Hits          470      482      +12     
- Misses        106      110       +4     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[bergnerjonas]

This change now ensures that we are fine with either user + password or user only (if token is used).
Of course, this does not check whether the credentials are valid.
However, we check the validity of the credentials when they are set with the functions set_credentials etc., so I opted to not check them here again. Otherwise, we would call the /logincheck endpoint each time the user wants to get a table.
What do you think @pmayd ?