Calculating SNP metrics using previously calculated hashes

[Villain88]

Hello
In our project we use a calculator to calculate expected metrics for Sev SNP.

Unfortunately, we do not always have access to the kernel and initrd files and also to the command line, but we know their hashes. The library does not have methods for obtaining metrics using hashes, moreover, some of the methods are private and do not allow me to implement such a method myself without duplicating the code. I had to fork and implement such a method.

Super-Protocol@5a2d633

Would you be interested in having such a method in the library? I could refine it to meet your requirements.

[DGonzalezVillal]

If you create a PR to modify and add those methods we would gladly review them