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Add all known `target_feature` configs to check-cfg This PR adds all the known `target_feature` from ~~`rustc_codegen_ssa`~~ `rustc_target` to the well known list of check-cfg. It does so by moving the list from `rustc_codegen_ssa` to `rustc_target` ~~`rustc_session` (I not sure about this, but some of the moved function take a `Session`)~~, then using it the `fill_well_known` function. This already proved to be useful since portable-simd had a bad cfg. cc `@nnethercote` (since we discussed it in https://github.com/rust-lang/rust/pull/118494)
Please read the rustc-dev-guide chapter on Backend Agnostic Codegen.