feat(objtool): add masm2masp command

[mooori]

Enables generating masp from masm.

With this we can compare masp built from handwritten masm to masp generated by the compiler from Rust code.

[mooori]

In the meantime I've learned that cargo miden / midenc will support masm -> masp. So objtool masm2masp is at most an ad-hoc tool to do some benchmarking of compilation artifact sizes. Hence there are some unresolved TODOs left in the diff.

@bitwalker could you take a look if this is correctly assembling masp from masm? That's handled in fn run in masm2masp.rs. Then we could report some numbers regarding the size difference of compiled vs handwritten programs.

I've tested objtool masm2masp on the handwritten basic wallet.