Fix token rpc-client methods (bp #11361) (#11362)

* Fix token rpc-client methods (#11361)

* Convert None to error in parse_keyed_accounts

* Allow encoding configuration in getTokenAccounts methods

(cherry picked from commit d0144ce382)

# Conflicts:
#	core/src/rpc.rs

* Fix conflicts

Co-authored-by: Tyera Eulberg <teulberg@gmail.com>
Co-authored-by: Tyera Eulberg <tyera@solana.com>

client/src/rpc_client.rs

@@ -1130,7 +1130,15 @@ fn parse_keyed_accounts(
                 request,
             )
         })?;
-        pubkey_accounts.push((pubkey, account.decode().unwrap()));
+        pubkey_accounts.push((
+            pubkey,
+            account.decode().ok_or_else(|| {
+                ClientError::new_with_request(
+                    RpcError::ParseError("Account from rpc".to_string()).into(),
+                    request,
+                )
+            })?,
+        ));
     }
     Ok(pubkey_accounts)
 }