feat(Skeleton): add round prop

[chenjiahan]

No description provided.

[codecov-commenter]

Codecov Report

Merging #6441 into dev will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #6441   +/-   ##
=======================================
  Coverage   91.36%   91.36%           
=======================================
  Files         171      171           
  Lines        4530     4530           
  Branches      292      292           
=======================================
  Hits         4139     4139           
  Misses        350      350           
  Partials       41       41           

Impacted Files	Coverage Δ
src/skeleton/index.tsx	100.00% <ø> (ø)

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