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/bonk_copy_trading/src/main.rs

@@ -152,7 +152,6 @@ async fn bonk_copy_trade_with_grpc(trade_info: BonkTradeEvent) -> AnyResult<()>
             Box::new(BonkParams::from_trade(trade_info.clone())),
             None,
             true,
-            None,
         )
         .await?;
 
@@ -179,7 +178,6 @@ async fn bonk_copy_trade_with_grpc(trade_info: BonkTradeEvent) -> AnyResult<()>
             Box::new(BonkParams::from_trade(trade_info.clone())),
             None,
             true,
-            None,
         )
         .await?;