Function init_fuzzing 

pub fn init_fuzzing()

One time start up initialization for fuzzing:

• Enables env_logger.

• Restricts rayon to a single thread in its thread pool, for more deterministic executions.

If a fuzz target is taking raw input bytes from the fuzzer, it is fine to call this function in the fuzz target’s oracle or in the fuzz target itself. However, if the fuzz target takes an Arbitrary type, and the Arbitrary implementation is not derived and does interesting things, then the Arbitrary implementation should call this function, since it runs before the fuzz target itself.