feat: better plotting for grid plans

[tlambert03]

This just adds field-of-view and outer-bounds plotting for grid plans, top help debugging #226

GridFromEdges(overlap=0, top=0, left=0, bottom=20, right=20, fov_height=10, fov_width=10).plot()

GridFromEdges(overlap=10, top=0, left=0, bottom=20, right=30, fov_height=10, fov_width=20).plot()

[codecov]

Codecov Report

Attention: Patch coverage is 96.87500% with 1 line in your changes missing coverage. Please review.

Project coverage is 97.52%. Comparing base (cb9b4fc) to head (b3f1e78).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/useq/_grid.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #227      +/-   ##
==========================================
+ Coverage   93.96%   97.52%   +3.55%     
==========================================
  Files          22       22              
  Lines        1509     1536      +27     
==========================================
+ Hits         1418     1498      +80     
+ Misses         91       38      -53     

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