Add `wasm` support and minors to `setup` command

[0xjei]

This PR is going to add fully support for WASM files (artifacts needed for proof generation) and some minors.

The pre-condition is that the R1CS files must have the same name of the WASM files.

• [x] https://github.com/privacy-scaling-explorations/groth-p0tion/issues/59
• [x] https://github.com/privacy-scaling-explorations/groth-p0tion/issues/67