feat(dropdown): inline prop

[bmdalex]

feat(dropdown): inline prop

Description:

This PR implements the inline prop for Dropdown component.

There will be a follow-up PR with a prototype on how to handle the inline Dropdown in the context of a rich text editor

API

<Dropdown inline items={inputItems} placeholder="Select your hero" />

Styling

[codecov]

Codecov Report

Merging #863 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #863   +/-   ##
=======================================
  Coverage   93.54%   93.54%           
=======================================
  Files          21       21           
  Lines         728      728           
  Branches       69       73    +4     
=======================================
  Hits          681      681           
  Misses         47       47

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