feat: add transaction simulation support and close_mint_token_ata parameter

- Add `simulate` parameter to TradeBuyParams and TradeSellParams for transaction simulation
- Add `close_mint_token_ata` parameter to TradeSellParams for closing mint token ATA
- Implement simulate_transaction function to validate transactions without blockchain submission
- Update all examples to include new parameters (simulate: false, close_mint_token_ata: false)
- Add comprehensive documentation for transaction simulation feature
- Show detailed simulation output including logs, compute units, and errors
- Print timing metrics in English for better international compatibility

examples/nonce_cache/src/main.rs

@@ -158,6 +158,7 @@ async fn pumpfun_copy_trade_with_grpc(trade_info: PumpFunTradeEvent) -> AnyResul
         durable_nonce: durable_nonce,
         fixed_output_token_amount: None,
         gas_fee_strategy: gas_fee_strategy,
+        simulate: false,
     };
     client.buy(buy_params).await?;