Export symbols (for hoist blacklisting)

[helixbass]

Background:

I was running into buggy behavior when trying to compose() two react-apollo graphql() HOCs, each with a following withProps() ie

compose(
  graphql(...),
  withProps(...),
  graphql(...),
  withProps(...)
)

Turned out that graphql() copies all static properties using hoist-non-react-statics, including the symbols that recompact uses ("internally") to keep track of its state eg compactability, so withProps() was treating graphql() as though it were another recompact HOC and bugginess ensued

In this PR:

• Export the MAPPERS_INFO and compactable symbols so that they can be passed to eg hoist-non-react-statics blacklist

From my understanding of symbols, exporting the actual symbols used is necessary because there's no way to "recreate" them separately for use in a blacklist

[codecov]

Codecov Report

Merging #95 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #95   +/-   ##
=======================================
  Coverage   96.57%   96.57%           
=======================================
  Files          63       63           
  Lines         467      467           
=======================================
  Hits          451      451           
  Misses         16       16

Impacted Files	Coverage Δ
src/utils/createHOCFromMapper.js	100% <ø> (ø)	⬆️
src/utils/createCompactableHOC.js	100% <ø> (ø)	⬆️

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[matthieuprat]

Waiting to settle on #97 before moving forward with this PR.

[helixbass]

Replaced by #100