new lint: suggest ptr::eq() instead of "x as *const _ as usize == y as *const as usize"

[matthiaskrgr]

Inspired by rust-lang/rust#57547
This looks like it could be a clippy lint :)

[i-am-g2]

I want to do this. Please assign this to me.

[flip1995]

It's all yours! If you have any questions, we're happy to help. Just ask here or open a WIP PR.

[ambroisie]

I would like to work on this. Should I try using the previous PR as a basis?

Edit: after reading the contributor guidelines, I will do what was written :-).