Add redeem_vote_credits to runtime (#7910)

* Move redeem_vote_credits into runtime

* fixup

* test

* move stake manipulation to stake program

* chugga for less indentation

sdk/src/account_utils.rs

@@ -1,6 +1,8 @@
 //! useful extras for Account state
-use crate::account::{Account, KeyedAccount};
-use crate::instruction::InstructionError;
+use crate::{
+    account::{Account, KeyedAccount},
+    instruction::InstructionError,
+};
 use bincode::ErrorKind;
 
 /// Convenience trait to covert bincode errors to instruction errors.