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Uplift the (new solver) canonicalizer into `rustc_next_trait_solver` Uplifts the new trait solver's canonicalizer into a new crate called `rustc_next_trait_solver`. The crate name is literally a bikeshed-avoidance name, so let's not block this PR on that -- renames are welcome later. There are a host of other changes that were required to make this possible: * Expose a `ConstTy` trait to get the `Interner::Ty` from a `Interner::Const`. * Expose some constructor methods to construct `Bound` variants. These are currently methods defined on the interner themselves, but they could be pulled into traits later. * Expose a `IntoKind` trait to turn a `Ty`/`Const`/`Region` into their corresponding `*Kind`s. * Some minor tweaks to other APIs in `rustc_type_ir`. The canonicalizer code itself is best reviewed **with whitespace ignored.** r? ``@lcnr``