feat(Icon): disabled prop disables onClick

[danielsyang]

Added behaviour of not running onClick function when Icon is disabled.
Very similar with what is already available in the Button component.

Fixes #3341.

[welcome]

💖 Thanks for opening this pull request! 💖

Here is a list of things that will help get it across the finish line:

• Run yarn lint locally to catch formatting errors. This will fix some errors automatically, commit and push any changes.
• Run yarn test locally to catch errors. This ensures all components still behave as they should.
• Run yarn start to run the doc site locally and try a few pages, ensuring everything is in good working order.
• Include tests when adding/changing behavior.

We get a lot of pull requests on this repo, so please be patient and we will get back to you as soon as we can.

[codecov-io]

Codecov Report

Merging #3358 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3358      +/-   ##
==========================================
+ Coverage   99.89%   99.89%   +<.01%     
==========================================
  Files         170      170              
  Lines        2807     2812       +5     
==========================================
+ Hits         2804     2809       +5     
  Misses          3        3

Impacted Files	Coverage Δ
src/elements/Icon/Icon.js	100% <100%> (ø)	⬆️

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[welcome]

Congrats on merging your first pull request! 🎉🎉🎉

[spencer-brown]

Awesome. Thanks, @shuminyang !

[levithomason]

Released in [email protected].