Part of Enhancing Compatibility with runc

There are differences between the exec command in runc and youki.

Please refer to the following:
https://github.com/opencontainers/runc/blob/main/man/runc-exec.8.md

The exec command in Youki currently does not support several options that are available in runc, such as --ignore-paused and --preserve-fds.