feat(zkvms/risc0): Implement elf encoding

Recently, RISC0 have added code to their SDK which adds magic bytes to
the (already compiled) ELF. Since we're taking another route than
intended, we'll need to replicate this step too.

We're doing things in a different fashion, because their SDK normally
compiles the guest, and doesn't allow you to supply a prebuilt ELF.

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