Add support for auto-scoped tokens

[s-hamann]

This PR implements support auto-scoped tokens (desec-io/desec-stack#885).

Tests are currently missing due to an upstream bug (desec-io/desec-stack#995).

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 65.21%. Comparing base (4f6fc1e) to head (204fc80).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
desec.py	62.50%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   65.30%   65.21%   -0.09%     
==========================================
  Files           1        1              
  Lines         732      756      +24     
==========================================
+ Hits          478      493      +15     
- Misses        254      263       +9     

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