This PR does not upgrade rustc. Only changes are applied.
We cannot upgrade to the lastet Rust version yet due to wasm-bindgen
breaking some generated types.
THere's also some elided lifetimes in `**/generated/**`, which requires
modification to ast tools.
Move post-transform checker into a `tasks` crate. It doesn't feel like it belongs in `oxc_semantic`. It also feels like too heavy a lump of code to put in `tasks/common`.
