test: Investigate Fuzzing

[0xNeshi]

As per our agreement, this PR includes a basic fuzz tests setup and some missing unit/property tests for openzeppelin-crypto crate.

I created a couple of related issues to address missing property tests (see #501 #502 #503).
Adding property tests for contract will be easily possible after motsu is refactored (see https://github.com/OpenZeppelin/stylus-test-helpers/pull/14/files#r1919897820)

Resolves #458

PR Checklist

• Tests
• Documentation
• Changelog

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.7%. Comparing base (e005e5b) to head (42bdb8b).

Additional details and impacted files

Files with missing lines	Coverage Δ
lib/crypto/src/bits.rs	100.0% <100.0%> (ø)
lib/crypto/src/hash.rs	61.7% <100.0%> (-14.2%)	⬇️
lib/crypto/src/keccak.rs	100.0% <100.0%> (ø)
lib/crypto/src/merkle.rs	97.8% <100.0%> (-0.1%)	⬇️

[bidzyyys]

I like the scenarios, great job @0xNeshi!
Left some comments.

[bidzyyys]

@0xNeshi we should consider fuzzing for this folder -> https://github.com/OpenZeppelin/rust-contracts-stylus/tree/main/contracts/src/utils/math

[0xNeshi]

@0xNeshi we should consider fuzzing for this folder -> https://github.com/OpenZeppelin/rust-contracts-stylus/tree/main/contracts/src/utils/math

Definitely 💯 We will need shims for this to work though, I'd suggest we hold off on this for now

[bidzyyys]

LGTM!