fix(vm): Add parser for CustomEFIDisk

[kaje783]

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Add parser to use efi disk for UEFI

Closes #202

[bpg]

Thanks again @kaje783! 👍🏻

Just a minor feedback about the size parsing.

[bpg]

I think it would be better to use parseDiskSize(string) from utils.go, for consistency.

Suggested change

	size := strings.ReplaceAll(v[1], "M", "")
	iv, err := strconv.Atoi(size)
	iv, err := parseDiskSize(v[1])

[kaje783]

@bpg the function parseDiskSize(&string) is much better for this, i have changed it.
Thanks.

[bpg]

Cool, I've added unit tests for the func and refactored the code a bit to address linter errors and remove duplication.

LGTM! 🚀