Add ability to limit memory usage by raw_exec driver

[tantra35]

In nowadays nomad in raw_exec driver uses cgroup to kill full process group(#4350). If so it will be logical use cgroup, to limit task in raw_exec by resources as exec driver does

[preetapan]

@tantra35 as you mentioned the exec driver does this already so we don't plan to make raw_exec work exactly like exec. It was designed for use cases where isolation is not needed.

[tantra35]

@preetapan unfortunately exec driver doesn't allow to launch program as root, only nobody, but this doesn't allow to call setrlimit to increase RLIMIT_NOFILE for example

[github-actions]

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