Trial miracl-trussed wrapping

[nickray]

The miracl/core library is an option to provide implementations of a wider range of (non-core) algorithms in Trussed.

While the implementations are definitely "C translated to Rust", and likely not very speedy

• it's good to have a wide range of algorithms at least for testing purposes
• this can be a test-bed for how we want to implement "configurable algorithms with configurable backends".

Adding to solo2 in Trussed adds 14.9K code, 9.9K from miracl32.