dillon1000/react

[Fizz] Implement New Context (#21255)

* Add NewContext module

This implements a reverse linked list tree containing the previous
contexts.

* Implement recursive algorithm

This algorithm pops the contexts back to a shared ancestor on the way down
the stack and then pushes new contexts in reverse order up the stack.

* Move isPrimaryRenderer to ServerFormatConfig

This is primarily intended to be used to support renderToString with a
separate build than the main one. This allows them to be nested.

* Wire up more element type matchers

* Wire up Context Provider type

* Wire up Context Consumer

* Test

* Implement reader in class

* Update error codez