Add support for Hermit-rs

[cmainas]

urunc as a unikernel container runtime should be able to support various unikernel frameworks. One active framework is Hermit-rs, written in rust and supporting various applications.

[AyushSriv06]

Hi!
I'm interested in working on this issue. Before I start, I noticed that Hermitux is no longer actively maintained and their README recommends Unikraft as an alternative.
Given this, should we still proceed with adding Hermitux support?
@ananos @cmainas

[cmainas]

Hello @AyushSriv06 , you are correct. The issue needs to get updated with hermit-rs.