Summary:
@public
`ContextContainer` is general purpose DI container for Fabric.
We need this to communicate some enviroment-specific and/or platform-specific modules down to cross-platform C++ code.
The first one will be ImageManager. Soon.
Reviewed By: fkgozali
Differential Revision: D8475636
fbshipit-source-id: 0afc65063f818d0bab736cd2c55c6fdd21b629ac