RFC: warn when returning different hooks on subsequent renders (#14585)

* warn when returning different hooks on next render

like it says. adds a field to Hook to track effect 'type', and compares when cloning subsequently.

* lint

* review changes

- numbered enum for hook types
- s/hookType/_debugType
- better dce

* cleaner detection location

* redundant comments

* different EffectHook / LayoutEffectHook

* prettier

* top level currentHookType

* nulling currentHookType

need to verify dce still works

* small enhancements

* hook order checks for useContext/useImperative

* prettier

* stray whitespace

* move some bits around

* better errors

* pass tests

* lint, flow

* show a before - after diff

* an error stack in the warning

* lose currentHookMatches, fix a test

* tidy

* clear the mismatch only in dev

* pass flow

* side by side diff

* tweak warning

* pass flow

* dedupe warnings per fiber, nits

* better format

* nit

* fix bad merge, pass flow

* lint

* missing hooktype enum

* merge currentHookType/currentHookNameInDev, fix nits

* lint

* final nits