dillon1000/react

Add unstable context bailout for profiling (#30407)

**This API is not intended to ship. This is a temporary unstable hook
for internal performance profiling.**

This PR exposes `unstable_useContextWithBailout`, which takes a compare
function in addition to Context. The comparison function is run to
determine if Context propagation and render should bail out earlier.
`unstable_useContextWithBailout` returns the full Context value, same as
`useContext`.

We can profile this API against `useContext` to better measure the cost
of Context value updates and gather more data around propagation and
render performance.

The bailout logic and test cases are based on
https://github.com/facebook/react/pull/20646

Additionally, this implementation allows multiple values to be compared
in one hook by returning a tuple to avoid requiring additional Context
consumer hooks.