feat(Icon): support positions in corner prop

[layershifter]

Fixes #3304.

[codecov-io]

Codecov Report

Merging #3315 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3315   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files         170      170           
  Lines        2802     2802           
=======================================
  Hits         2799     2799           
  Misses          3        3

Impacted Files	Coverage Δ
src/elements/Icon/Icon.js	100% <ø> (ø)	⬆️

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