Assert that the fragment passed to useResult (et al?) never changes

[rbalicki2]

We should do something like https://github.com/facebook/relay/blob/f19f330f4e7614f36e612f75ee891fae46c8b09b/packages/react-relay/relay-hooks/useStaticFragmentNodeWarning.js#L4

• We don't have a concept of a dev variable, so for now, we can just do it
• Make this hook generic, i.e. call it useAssertUnchangingValue or something, and throw an error if it changes
• Add it to useResult

[PatrykWalach]

useResult should work fine if the fragment returns a component right now,
in case it's a resolver, then it will not rerender right now, but it will be fixed in #343,

then we should only assert that the type of the fragment doesn't change?