FB-specific builds of Flight Server, Flight Client, and React Shared Subset (#27579)

This PR adds a new FB-specific configuration of Flight. We also need to
bundle a version of ReactSharedSubset that will be used for running
Flight on the server.

This initial implementation does not support server actions yet.

The FB-Flight still uses the text protocol on the server (the flag
`enableBinaryFlight` is set to false). It looks like we need some
changes in Hermes to properly support this binary format.