Auto merge of #118725 - lcnr:normalizes-to-projection-split-3, r=BoxyUwU

split `NormalizesTo` out of `Projection` 3

third attempt at #112658. Rebasing #116262 is very annoying, so I am doing it again from scratch. We should now be able to merge it without regressing anything as we handle occurs check failures involving aliases correctly since #117088.

see https://hackmd.io/ktEL8knTSYmtdfrMMnA-Hg

fixes rust-lang/trait-system-refactor-initiative#1

r? `@compiler-errors`

Author: bors