add spatial resolution

[leoguignard]

Add a way to incorporate spatial resolution when doing spatial computation

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.39%. Comparing base (1dcd0d0) to head (508e29d).
⚠️ Report is 7 commits behind head on v3.x.

Files with missing lines	Patch %	Lines
src/lineagetree/lineage_tree.py	87.50%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             v3.x      #94   +/-   ##
=======================================
  Coverage   86.39%   86.39%           
=======================================
  Files          20       20           
  Lines        1793     1801    +8     
=======================================
+ Hits         1549     1556    +7     
- Misses        244      245    +1     

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