feat: v0.5.5 - enhanced priority fee system and dependency updates

- Update solana-streamer-sdk to 0.4.1
- Refactor priority fee API (custom_buy_tip_fee → custom_priority_fee)
- Simplify documentation and clean up examples

BREAKING CHANGE: priority fee parameter type changed

examples/raydium_amm_v4_trading/src/main.rs

@@ -161,7 +161,6 @@ async fn raydium_amm_v4_copy_trade_with_grpc(trade_info: RaydiumAmmV4SwapEvent)
             Box::new(params),
             None,
             true,
-            None,
         )
         .await?;
 
@@ -189,7 +188,6 @@ async fn raydium_amm_v4_copy_trade_with_grpc(trade_info: RaydiumAmmV4SwapEvent)
             Box::new(params),
             None,
             true,
-            None,
         )
         .await?;