Expose all of the CBMC flags that Kani is using to the C++/Rust API

[NlightNFotis]

To enable Kani to be able to depend on the CBMC Rust API for a full verification run, without any need for interaction with the binary-based version of CBMC.

To do that, we would need to export the following flags to the C++ (and subsequently the Rust API):

• --validate-goto-equation
• --trace
• --object-bits
• --unwind
• --bounds-check
• --pointer-check
• --div-by-zero-check
• --float-overflow-check
• --unwinding-assertions
• --pointer-overflow-check
• --pointer-primitive-check