Action in actions-rs for cargo-mutants?

[sourcefrog]

cargo mutants is a cargo plugin that finds insufficiently tested code.

It can be run from CI as in https://github.com/sourcefrog/cargo-mutants#continuous-integration, for example as in https://github.com/sourcefrog/unix_mode/runs/7303576645?check_suite_focus=true.

Would it be acceptable in principle to add this in to actions-rs?

cc https://github.com/sourcefrog/cargo-mutants/pull/37 @sgodwincs