feat(virtq): add packed virtio ring primitives #3889

Job	Run time
check license headers	5s
docs-pr	6s
spell check with typos	8s
update-guest-locks	-1s
code-checks / linux-checks	11s
code-checks / windows-checks	12s
build-guests (release) / build-guests	19s
build-guests (debug) / build-guests	19s
run-examples	0s
fuzzing	0s
build-test	0s
report-ci-status	3s
	1m 22s

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