Improve DWData type hints

[tobiaslatour]

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[codecov]

Codecov Report

Attention: Patch coverage is 97.77778% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.53%. Comparing base (2333717) to head (0df77b7).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
detl/core.py	97.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   90.22%   92.53%   +2.30%     
==========================================
  Files           7        7              
  Lines         307      308       +1     
==========================================
+ Hits          277      285       +8     
+ Misses         30       23       -7     

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