message: export the PublicKeyFromStrError so from_str impl can be reused
diff: @@ -37,8 +37,8 @@ mod vrf;
  pub use evolving::{EvolvingStatus, KeyEvolvingAlgorithm};
  pub use kes::KeyEvolvingSignatureAlgorithm;
  pub use key::{
  - AsymmetricKey, AsymmetricPublicKey, KeyPair, PublicKey, PublicKeyError, SecretKey,
  - SecretKeyError, SecretKeySizeStatic,
  + AsymmetricKey, AsymmetricPublicKey, KeyPair, PublicKey, PublicKeyError, PublicKeyFromStrError,
  + SecretKey, SecretKeyError, SecretKeySizeStatic,
  };
  pub use sign::{Signature, SignatureError, SigningAlgorithm, Verification, VerificationAlgorithm};
  pub use vrf::{
  