Add SimulateTransaction RPC endpoint (#10106) (#10116)

automerge

client/src/rpc_request.rs

@@ -40,6 +40,7 @@ pub enum RpcRequest {
     RegisterNode,
     RequestAirdrop,
     SendTransaction,
+    SimulateTransaction,
     SignVote,
     GetMinimumBalanceForRentExemption,
     MinimumLedgerSlot,
@@ -84,6 +85,7 @@ impl fmt::Display for RpcRequest {
             RpcRequest::RegisterNode => "registerNode",
             RpcRequest::RequestAirdrop => "requestAirdrop",
             RpcRequest::SendTransaction => "sendTransaction",
+            RpcRequest::SimulateTransaction => "simulateTransaction",
             RpcRequest::SignVote => "signVote",
             RpcRequest::GetMinimumBalanceForRentExemption => "getMinimumBalanceForRentExemption",
             RpcRequest::MinimumLedgerSlot => "minimumLedgerSlot",