feat(vm): add support for cpu affinity attribute (#1148)

[sergelogvinov]

It helps to pin VMs to the special cpu.

Contributor's Note

• I have added / updated documentation in /docs for any user-facing features or additions.
• I have added / updated templates in /example for any new or updated resources / data sources.
• I have ran make example to verify that the change works as expected.

Proof of Work

  cpu {
    cores = 2
    affinity = "2,3"
  }

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Closes #1148

[bpg]

Thanks so much for contributing this feature @sergelogvinov!

I've made a few fixes for the default case when affinity is not set, and also added a bit more details to the docs.

All my tests pass, both make example and make testacc, so I think it is good to go.

LGTM! 🚀

[bpg]

@all-contributors please add @sergelogvinov for code

[allcontributors]

@bpg

I've put up a pull request to add @sergelogvinov! 🎉