ctap2-proto: Derive serde types for UsizeN

Just a wrapper struct around bounded_integer::BoundedUsize the
bounded_integer/serde1 feature needs to be enabled.

crates/ctap2-proto/Cargo.toml

@@ -12,4 +12,4 @@ coset = "0.3.3"
 serde = { version = "1.0", features = ["derive"], optional = true }
 
 [features]
-serde = ["dep:serde", "fido-common/serde"]
+serde = ["dep:serde", "fido-common/serde", "bounded-integer/serde1"]

crates/ctap2-proto/src/authenticator/device.rs

@@ -7,8 +7,12 @@ use std::collections::{BTreeMap, BTreeSet};
 use std::num::NonZeroUsize;
 use std::usize;
 
+#[cfg(feature = "serde")]
+use serde::{Deserialize, Serialize};
+
 /// A usize with a minimum value of N
 #[derive(Debug, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct UsizeN<const N: usize>(bounded_integer::BoundedUsize<N, { usize::MAX }>);
 
 /// > data type byte string and identifying the authenticator model, i.e.