Add random_seed getter fn

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to Rust's notion of
 - `note`:
   - `RandomSeed` and its functions `from_bytes` and `as_bytes` now public
   -  `Note::from_parts` now public
+  - added pub fn `random_seed`
 - `keys::Diversifier::from_bytes` now public
 
 ## [0.2.0] - 2022-06-24

src/note.rs

@@ -126,6 +126,11 @@ impl Note {
         }
     }
 
+    ///Get the seed randomness used by the note
+    pub fn random_seed(&self) -> &RandomSeed {
+        &self.rseed
+    }
+
     /// Generates a new note.
     ///
     /// Defined in [Zcash Protocol Spec § 4.7.3: Sending Notes (Orchard)][orchardsend].