feat(Segment): add props interface

[mnajdova]

This PR introduces props interface for the Segment component, as part of #117
In the PR are also introduced some fixes in the ChatMessage and MenuItem components too.

[codecov]

Codecov Report

Merging #175 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #175   +/-   ##
=======================================
  Coverage   68.02%   68.02%           
=======================================
  Files         101      101           
  Lines        1370     1370           
  Branches      260      269    +9     
=======================================
  Hits          932      932           
  Misses        436      436           
  Partials        2        2

Impacted Files	Coverage Δ
src/components/Menu/MenuItem.tsx	92.3% <ø> (ø)	⬆️
src/components/Chat/ChatMessage.tsx	100% <ø> (ø)	⬆️
src/components/Segment/Segment.tsx	100% <100%> (ø)	⬆️

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