Vars to theme Breadcrumb component

[mrgeorgegray]

Adds vars to theme <Breadcrumb /> component

• changes to master
• Make sure that 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.

[codecov]

Codecov Report

Merging #9022 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9022   +/-   ##
=======================================
  Coverage   85.24%   85.24%           
=======================================
  Files         194      194           
  Lines        4671     4671           
  Branches     1377     1377           
=======================================
  Hits         3982     3982           
  Misses        689      689

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