Improve image overlay

[Ariana-B]

Determine image overlay bounds based on dataset bounds instead of extent for better overlap

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📚 Documentation preview 📚: https://datacube-explorer--506.org.readthedocs.build/en/506/

[robbibt]

Looks fantastic! I'll do another closer review when it's live on Dev Explorer to see how it handles some weirder edge cases, but I think this should clear up most of the plotting issues for weird shaped geoms. Thanks @Ariana-B !

[codecov]

Codecov Report

Base: 86.04% // Head: 86.05% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (b0b4a8d) compared to base (bd72adf).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #506      +/-   ##
===========================================
+ Coverage    86.04%   86.05%   +0.01%     
===========================================
  Files           24       24              
  Lines         3188     3192       +4     
===========================================
+ Hits          2743     2747       +4     
  Misses         445      445              

Impacted Files	Coverage Δ
cubedash/_dataset.py	92.85% <ø> (ø)
cubedash/_utils.py	89.29% <100.00%> (+0.11%)	⬆️

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