Histogram hscroll pan

[gselzer]

This PR enables panning histograms using horizontal scroll in both vispy and pygfx.

TODO:

• Clean up
• Test

Closes #172

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 3 lines in your changes missing coverage. Please review.

Project coverage is 85.21%. Comparing base (428fd96) to head (1e80365).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ndv/views/_pygfx/_histogram.py	83.33%	2 Missing ⚠️
src/ndv/views/_vispy/_plot_widget.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #176      +/-   ##
==========================================
+ Coverage   84.56%   85.21%   +0.65%     
==========================================
  Files          45       45              
  Lines        4521     4713     +192     
==========================================
+ Hits         3823     4016     +193     
+ Misses        698      697       -1     

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[gselzer]

@tlambert03 I'm pretty happy with this, works nicely with both mouse and trackpad. Since you requested the feature, thoughts?

[tlambert03]

looks/works good! thanks