Change our no_std allocator

[ludfjig]

We are currently using buddy-system-allocator inside guests. We should consider switching this out to a more performance allocator.

Some options:

• mimalloc (if possible?)
• Talc https://github.com/SFBdragon/talc
• dlmalloc

Maybe more?

[prydt]

Hi, I was wondering if I could take this issue.

If so, I was wondering if there are any good benchmarks for hyperlight I should use to compare different allocators.