Add trait for StatusBytes and allow lazyly configuring the initialization of the RNG

[sosthene-nitrokey]

No description provided.

[robin-nitrokey]

Maybe it would be easier to only serialize on demand so we don’t need to parse and modify the bytes representation in the runner.

Suggested change

	/// Trait indicating that a value can be used as a status
	pub trait StatusBytes: AsRef<[u8]> {
	// Set the flag indicating that the random generator could properly be created (`false`) or not (`true`)
	fn set_random_error(&mut self, value: bool);
	// Get the flag indicating that the random generator could properly be created (`false`) or not (`true`)
	fn get_random_error(&self) -> bool;
	}
	/// Trait indicating that a value can be used as a status
	pub trait Status {
	// Returns the flag indicating that the random generator could properly be created (`false`) or not (`true`)
	fn random_error(&mut self, value: bool) -> &mut Option<bool>;
	// Writes the byte representation of this status value to a vec.
	fn serialize_bytes<const N: usize>(&self, v: &mut Vec<u8, N>);
	}

[sosthene-nitrokey]

If I were to do this this way I would probably do it with

pub trait Status {
    type Serialized: AsRef<[u8]>; 
    fn serialize(&self) -> Self::Serialized;
}

[robin-nitrokey]

I’d rather avoid the de-/serialization round trips required for get_random_error/set_random_error, otherwise LGTM.