Image Block: Resizing an image sets the figure wrapper

[youknowriad]

closes #2543

This PR apply the image resized width to its figure wrapper to constrain the caption in these boundaries.

Note: This PR makes previously resized image blocks invalid.

[codecov]

Codecov Report

Merging #2682 into master will increase coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #2682      +/-   ##
==========================================
+ Coverage   33.03%   33.04%   +<.01%     
==========================================
  Files         182      182              
  Lines        5533     5535       +2     
  Branches      963      965       +2     
==========================================
+ Hits         1828     1829       +1     
  Misses       3137     3137              
- Partials      568      569       +1

Impacted Files	Coverage Δ
blocks/library/image/block.js	0% <0%> (ø)	⬆️
blocks/library/image/index.js	64.7% <100%> (+2.2%)	⬆️

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[karmatosed]

This fixes the issue, thanks!