cartopy data ratio requires draw

[mathause]

• Closes aspect ratio requires draw for cartopy maps #60
• Tests added
• Passes isort . && black . && flake8
• Fully documented, including CHANGELOG.md

[codecov-commenter]

Codecov Report

Base: 94.68% // Head: 94.80% // Increases project coverage by +0.12% 🎉

Coverage data is based on head (f45f66b) compared to base (40b30d8).
Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #61      +/-   ##
==========================================
+ Coverage   94.68%   94.80%   +0.12%     
==========================================
  Files           7        7              
  Lines         376      385       +9     
==========================================
+ Hits          356      365       +9     
  Misses         20       20              

Flag	Coverage Δ
min-all-deps	94.79% <100.00%> (+0.12%)	⬆️
unittests	94.80% <100.00%> (+0.12%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mplotutils/cartopy_utils.py	86.88% <100.00%> (+0.92%)	⬆️
mplotutils/map_layout.py	100.00% <100.00%> (ø)

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