feat(Grid): add direction prop

[chenjiahan]

No description provided.

[codecov-io]

Codecov Report

Merging #6256 into dev will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##              dev    #6256   +/-   ##
=======================================
  Coverage   91.51%   91.51%           
=======================================
  Files         171      171           
  Lines        4490     4490           
  Branches      293      293           
=======================================
  Hits         4109     4109           
  Misses        338      338           
  Partials       43       43           

Impacted Files	Coverage Δ
src/grid/index.js	100.00% <ø> (ø)
src/grid-item/index.js	97.14% <100.00%> (ø)

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