Add proc macros for benchmarking

[mateuszmlc]

Includes #26.

Went with bench::main!(assert, fib, sha256, ...); instead of just bench::main!() because static-constructors/ctors (running init code before main) is not supported in WASM (or LLVM -> WASM rather) yet

[linear[bot]]

ENG-1021 Proc macros

We can provide a nicer interface for benchmarking by implementing proc-macros like so: ``` use benchy::benchmark; #[benchmark("fib", [ ("1 byte", 1), ("10 bytes", 10) ])] fn fib(b: &mut BenchmarkRun, n: u32) { ... } benchy::main!(); ``` This also makes it more obvious that you shouldn't share state between benchmark runs, as the functions get run in a forked process, to get accurate memory usage metrics.

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
zk-benchmarks	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 14, 2023 5:50pm

[mateuszmlc]

Considering renaming bench::bench to benchmark so that it doesn't conflict with Rust's #[bench] attribute, because the error message is confusing if you forget to import use bench::bench.