Consider adding support for dealing with exit codes and saving the output of commands to a file

[TB99930]

Using pyproject-runner in CI, I'd like to capture the output of commands that don't natively support output to a file (specifically pyright). Normally, this would be a shell redirect (i.e. pyright --outputjson > pyright-output.json) but pyproject-runner doesn't support shell redirection syntax for obvious reasons. This could be handled within pyproject-runner by saving the output to a file as a configuration option. Other tools output an exit code and dealing with those would also be useful (e.g. ruff format --check).

[TB99930]

I made a PR #5 which implements optionally using the shell (for redirection, etc), and optionally ignoring return codes.