thiserror, docs, remove general Failure case (#9741)

automerge

sdk/src/hash.rs

@@ -1,5 +1,6 @@
 //! The `hash` module provides functions for creating SHA-256 hashes.
 
+use crate::sanitize::Sanitize;
 use sha2::{Digest, Sha256};
 use std::{convert::TryFrom, fmt, mem, str::FromStr};
 use thiserror::Error;
@@ -30,6 +31,8 @@ impl Hasher {
     }
 }
 
+impl Sanitize for Hash {}
+
 impl AsRef<[u8]> for Hash {
     fn as_ref(&self) -> &[u8] {
         &self.0[..]