Add fuzz tests to show equivalence between stdlib cryptographic functions and rust implementations

[TomAFrench]

We should add some fuzz tests which generates random inputs and feeds them into the stdlib implementations of keccak256/sha256/etc. alongside an off-the-shelf rust implementation to give greater assurances about correctness.

Note that this won't work with just a regular fuzz test but will need a rust harness.

[TomAFrench]

proptest usage: https://github.com/noir-lang/noir/blob/be9dcfe56d808b1bd5ef552d41274705b2df7062/tooling/noirc_abi/src/lib.rs#L503C7-L503C8

exeuctor:

noir/tooling/nargo/src/ops/execute.rs

Line 62 in be9dcfe

fn execute_circuit(

[TomAFrench]

compile from string snippet:

noir/tooling/lsp/src/lib.rs

Line 332 in be9dcfe

fn prepare_source(source: String, state: &mut LspState) -> (Context<'static, 'static>, CrateId) {