- Use default github rust version
- Stop using clippy action, it has been unmaintained since 2020
- No longer enforce nightly fmt rules in CI (they can still be enforced
  in commit hooks or nix
- No longer use cargo test unstable options
- Run `cargo clippy --fix` to fix new errors

* fix bench.rs

* fix script

* fix rayon bug

* simplify high degree tests

* temporarily turnoff a bench subset

* minor

* uncomment

* minor fix

* comment

* uncomment

* minor fix

Co-authored-by: zhenfei <zhenfei.zhang@hotmail.com>

- use sumcheck to batch open PCS
- split Prod and witness into two batches
- benchmark code