dillon1000/react

[RFC] Improve validation against ref access in render

The goal of this PR is to improve ValidateNoRefAccessInRender to find function 
expressions which a) access refs and b) may be called during render. Currently 
we always allow ref access in any function expression, but that's obviously 
optimistic. 

For the approach, the observation is that we already have a system that tells us 
whether a function may get called — mutable range inference. So long as we 
consider a function "mutable", we'll infer a range for it, but the problem is 
that we don't currently view functions which depend on refs to be mutable. So 
here I'm doing ~~sort of~~ a hack to force function deps on refs to be treated 
as Effect.Capture. This is enough for the function to be considered mutable, for 
a mutable range to be assigned, and for us to detect that during ref validation. 

I don't love the hack, i'm open to other ideas!