message: add FromPrimitive for CertificateTag
diff: @@ -5,6 +5,8 @@ use crate::{
  };
  use chain_core::property;
  use chain_crypto::{Ed25519Extended, SecretKey};
  +use num_derive::FromPrimitive;
  +use num_traits::FromPrimitive;
  #[derive(Debug, Clone)]
  pub struct SignatureRaw(Vec<u8>);
  