Add transition for the ant-tabs-ink-bar width

[hlehmann]

Currently when Tabs titles have very different width, the ink-bar width change without transition.

[mention-bot]

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

[codecov]

Codecov Report

Merging #5858 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5858   +/-   ##
=======================================
  Coverage   86.81%   86.81%           
=======================================
  Files         183      183           
  Lines        4558     4558           
  Branches     1323     1323           
=======================================
  Hits         3957     3957           
  Misses        601      601

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[lock]

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