feat: connectAtom HOC for class components

[ursarik]

#49
added connectAtom HOC to be able use Atom with class components

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@eac4844). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master   #107   +/-   ##
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  Coverage          ?   100%           
=======================================
  Files             ?      5           
  Lines             ?     71           
  Branches          ?     16           
=======================================
  Hits              ?     71           
  Misses            ?      0           
  Partials          ?      0

Impacted Files	Coverage Δ
src/react-atom-internal.tsx	100% <100%> (ø)

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