Lazy zoom

[raphaelquast]

add "lazy-zoom" and "zoom with mouse-wheel" abilities

[codecov]

Codecov Report

❌ Patch coverage is 66.16541% with 45 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.39%. Comparing base (63c5a3d) to head (a226814).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
eomaps/_zoom.py	57.89%	32 Missing ⚠️
eomaps/_blit_manager.py	80.00%	5 Missing ⚠️
eomaps/eomaps.py	60.00%	4 Missing ⚠️
eomaps/cb_container.py	75.00%	2 Missing ⚠️
eomaps/annotation_editor.py	0.00%	1 Missing ⚠️
eomaps/colorbar.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #268      +/-   ##
==========================================
+ Coverage   75.23%   75.39%   +0.16%     
==========================================
  Files          27       28       +1     
  Lines       11908    11998      +90     
==========================================
+ Hits         8959     9046      +87     
- Misses       2949     2952       +3     

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