dillon1000/react

[CS] Split Host Config Out into a Mutable or Immutable Mode (#11213)

* CS renderer

Because we didn't have enough RN experiments. I want to add one more.

* Split out hydration from the host config object

This makes it easier to do feature detection on the configuration.

* Move mutation host config to separate optional object

* Refs and life-cycles should happen even in immutable mode

* Unmount components even in non-mutation mode

This is the same as committing deletions but instead of finding host
components to delete, it only invokes componentWillUnmount and detaching
of refs.

* Add persistent updates API

This mode will use a clone based API instead of mutating host instances.

Needs implementation still.

It's awkward that there can be more than one child inserted into the root.
So we need a new API to create a "root" instance so that we can update it
atomically. Alternatively we could keep the mutable API for containers
and assume that most use cases would only have a single root.

* Package up CS renderer

* Fix reconciler package fixture