ENH: add mean_deviation

[u3ks]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.0%. Comparing base (4037c70) to head (d7d6acf).
Report is 56 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #620     +/-   ##
=======================================
+ Coverage   97.4%   98.0%   +0.6%     
=======================================
  Files         26      38     +12     
  Lines       4328    6184   +1856     
=======================================
+ Hits        4214    6059   +1845     
- Misses       114     125     +11     

Files	Coverage Δ
momepy/distribution.py	97.2% <100.0%> (-0.2%)	⬇️
momepy/functional/_diversity.py	96.8% <100.0%> (ø)
momepy/functional/tests/test_diversity.py	100.0% <100.0%> (ø)