Use IPython display

[has2k1]

1. Makes it possible to avoid string output that follows the output image.
2. Gained the ability to control the interactive figure format from
   within plotnine.

closes #694

[codecov]

Codecov Report

Attention: 96 lines in your changes are missing coverage. Please review.

Comparison is base (32f491a) 0.00% compared to head (4bdd7cc) 0.00%.

Files	Patch %	Lines
plotnine/_utils/ipython.py	0.00%	32 Missing ⚠️
plotnine/_utils/context.py	0.00%	29 Missing ⚠️
plotnine/ggplot.py	0.00%	29 Missing ⚠️
plotnine/themes/theme.py	0.00%	3 Missing ⚠️
plotnine/options.py	0.00%	2 Missing ⚠️
plotnine/typing.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #739   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files        178     180    +2     
  Lines      11166   11204   +38     
=====================================
- Misses     11166   11204   +38     

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[jasongrout-db]

Awesome, thanks!