[RFC] Removing &dyn Node from Visit

[kdy1]

The &dyn Node of the methods of Visit is useless and annoying. It's actually misdesigned, mainly because swc internally used a different visitor system when I made swc_ecma_visit.

I want to remove it but I'm not sure if it's used.
I'm going to create an alternative Visit if someone needs the &dyn Node argument.

[devongovett]

I just looked in Parcel's source code and we never use that argument. Sounds good to me!

[kwonoj]

I was curious where / when to use it too. +1 for public surface doesn't expose it.