Fix reconciler : Expose the contexts

[RenaudRohlinger]

Hello!

Description

To consume the contexts with react reconciler you need to forward the contexts using a "bridge". See https://github.com/facebook/react/issues/17275 Exposing each context is then necessary if we don't want to wrap all our components twice in that case.

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[RenaudRohlinger]

@googlebot I signed it!

[jhuleatt]

Hi @RenaudRohlinger, thanks for the PR! While this seems like a rare use case (react-reconciler is "Use it at your own risk" according to the React docs), I think it should be fine to merge if it will benefit you.

[jhuleatt]

This is available in ReactFire 4.2.1

[RenaudRohlinger]

Thanks!