docs(Modal): improve examples, use React hooks

[layershifter]

This PR:

• improves examples for Modal component
• refactors them use React hooks instead of class components
• adds bundle size fixture

[github-actions]

size-limit report

Path	Size
bundle-size/dist/Button.size.js	70.84 KB (0%)
bundle-size/dist/Icon.size.js	33.41 KB (0%)
bundle-size/dist/Image.size.js	66.13 KB (0%)
bundle-size/dist/Modal.size.js	108.63 KB (0%)
bundle-size/dist/Portal.size.js	49.9 KB (0%)

[codecov-commenter]

Codecov Report

Merging #4012 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4012   +/-   ##
=======================================
  Coverage   99.84%   99.84%           
=======================================
  Files         185      185           
  Lines        3251     3251           
=======================================
  Hits         3246     3246           
  Misses          5        5           

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[assuncaocharles]

This will add the newest logs in the beginning of the array, is it intentional?

[layershifter]

Yep, as it creates an order for entries output: