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Rollup merge of #157419 - khyperia:term_kind_rs, r=BoxyUwU
move rustc_type_ir Term things to term_kind.rs
- `TyKind`, `AliasTy`, and `AliasTyKind` live in `ty_kind.rs`
- `ConstKind`, [`UnevaluatedConst`, and `UnevaluatedConstKind`](https://github.com/rust-lang/project-const-generics/issues/115) live in `const_kind.rs`
- `TermKind`, `AliasTerm`, and `AliasTermKind` live in... `generic_arg.rs` and `predicate.rs` ???
create a new file, `term_kind.rs`, that holds `TermKind`, `AliasTerm`, and `AliasTermKind`
(note that `Ty`, `Const`, and `Term` live in `rustc_middle`, not `rustc_type_ir`)
