Record vote account commission with voting/staking rewards and surface in RPC

(cherry picked from commit 4098af3b5b)

# Conflicts:
#	docs/src/developing/clients/jsonrpc-api.md
#	runtime/src/bank.rs

cli/src/stake.rs

@@ -1822,6 +1822,7 @@ pub fn make_cli_reward(
             post_balance: reward.post_balance,
             percent_change: rate_change * 100.0,
             apr: Some(apr * 100.0),
+            commission: reward.commission,
         })
     } else {
         None