Add sdr.power()

[mhostetter]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.33%. Comparing base (802e773) to head (69e7648).

Files	Patch %	Lines
src/sdr/_measurement/_power.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           release/0.0.x     #409      +/-   ##
=================================================
+ Coverage          81.31%   81.33%   +0.01%     
=================================================
  Files                 63       63              
  Lines               3790     3798       +8     
=================================================
+ Hits                3082     3089       +7     
- Misses               708      709       +1     

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