10484: internal: Update match checking algorithm r=lnicola a=iDawer
Sync match checking algorithm with rust-lang/rust f31622a50 2021-11-12 (https://github.com/rust-lang/rust/pull/90813)
This update brings huge simplification to the match checking and introduces an easy to use machinery for pattern destructuring and also:
1. Add a function to do post-inference normalization `hir_ty::infer::normalize(...)`.
2. Store binding modes in `InferenceResult`.
Todo:
- [x] Rebase & test (https://github.com/rust-analyzer/rust-analyzer/pull/10484#issuecomment-996669665)
Co-authored-by: Dawer <7803845+iDawer@users.noreply.github.com>
Co-authored-by: iDawer <ilnur.iskhakov.oss@outlook.com>
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