Add ability to copy color when clicking on palette

[bsheikh]

First of all, thanks for your contribution! :-)

Please makes sure these boxes are checked before submitting your PR, thank you!

• Make sure you propose PR to correct branch: bugfix for master, feature for latest active branch feature-x.x.
• Make sure you follow antd's code convention.
• Run npm run lint and fix those errors before submitting in order to keep consistent code style.
• Rebase before creating a PR to keep commit history clear.
• Add some descriptions and refer relative issues for you PR.

[mention-bot]

@bsheikh, thanks for your PR! By analyzing the history of the files in this pull request, we identified @afc163, @benjycui and @ystarlongzi to be potential reviewers.

[codecov]

Codecov Report

Merging #5247 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5247   +/-   ##
=======================================
  Coverage   82.81%   82.81%           
=======================================
  Files         161      161           
  Lines        1641     1641           
  Branches      559      559           
=======================================
  Hits         1359     1359           
  Misses        282      282

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[benjycui]

👍