test(benchmarks): add benchmarks for proof generation

[ctrlc03]

Description

Add benchmarks that compare how much time it takes to generate proofs for different number of signups and messages. Both using WASM and Rapidsnark with c witness gen.

Related issue(s)

Re: #1081

Confirmation

• [x] I have read and understand MACI's contributor guidelines and code of conduct.
• [x] I have read and understand MACI's GitHub processes.
• [x] I have read and understand MACI's testing guide.

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[ctrlc03]

Closing for now as most of the code is outdated