feat(`cheatcodes`): add ability to switch between `proptest::test_runner::TestRng` and `rand::rngs::StdRng`

[StackOverflowExcept1on]

Component

Forge

Describe the feature you would like

In #8882, StdRng has been replaced by TestRng, but TestRng does not implement the CryptoRng trait. Because of this I can't just pass TestRng in some places and I have to explicitly use rand_chacha::ChaChaRng? For example, I want to port some crypto library from Rust to Solidity and I have to go into the proptest code, understand that TestRng does not implement CryptoRng and then copy the code from proptest which is based on rand_chacha::ChaChaRng. Maybe it makes sense to create a crate like forge-rng that would also implement CryptoRng and other traits. It might also make sense to allow switching between forge-rng and StdRng.

Additional context

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