refactor: optimize trading execution architecture and add wSOL management

- Simplify TradeExecutor interface by integrating middleware and swqos clients into params
- Refactor parallel execution module with dedicated buy/sell execute functions
- Add SOL wrapping/unwrapping functionality for wSOL management
- Remove redundant parameter passing in sell operations
- Delete example main.rs file
- Optimize transaction building with integrated parameter structures

BREAKING CHANGE: TradeExecutor interface simplified, middleware and swqos_clients now passed through params

examples/wsol_wrapper/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "wsol_wrapper"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+sol-trade-sdk = { path = "../.." }
+solana-sdk = "2.3.0"
+tokio = { version = "1", features = ["full"] }
+anyhow = "1.0"