feat: add track change support to images

[james-atticus]

Building on top of the approach from #3326, this adds support for tracked insert/delete of image runs. I considered doing something more similar to Inserted/DeletedTextRun but this feels like a more ergonomic API.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9439c73) to head (fb28a7b).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #3432   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          310       310           
  Lines         3173      3185   +12     
  Branches       716       719    +3     
=========================================
+ Hits          3173      3185   +12     

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