feat: export BottomTabBar props type

[dulmandakh]

I customize bottom tab bar wrapping BottomTabBar, and I need its props type. I'm not sure if it's proper way to do it, but Props from views is final type used in the component.

[codecov-io]

Codecov Report

Merging #109 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #109   +/-   ##
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  Coverage   93.51%   93.51%           
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  Files          33       33           
  Lines         709      709           
  Branches      181      188    +7     
=======================================
  Hits          663      663           
  Misses         38       38           
  Partials        8        8

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[osdnk]

Thanks!