feat: refactor to multi-protocol event streaming system

Major architectural refactor, upgrading from simple logging system to comprehensive multi-protocol Solana DEX event streaming system:

✨ New Features:
- Support for 5 DEX protocols: PumpFun, PumpSwap, Bonk, Raydium CPMM, Raydium CLMM
- Implement unified event interface (UnifiedEvent trait) and event factory pattern
- Add dual streaming support: Yellowstone gRPC and ShredStream
- Add Chinese documentation (README_CN.md)

🏗️ Architectural Improvements:
- Refactor event parsing system with modular design
- Implement protocol-specific parsers and event types
- Optimize dependency management, update Cargo.toml
- Remove legacy logging modules, clean up redundant code

📊 Statistics:
- Added 46 files, 4511 lines of code
- Removed 1381 lines of legacy code
- Net addition of 3130 lines of code

Tech Stack:
- Rust async/await for asynchronous processing
- Protocol Buffers support
- Multi-protocol event parsing
- High-performance event stream subscription

src/streaming/event_parser/mod.rs

@@ -0,0 +1,41 @@
+pub mod common;
+pub mod core;
+pub mod factory;
+pub mod protocols;
+
+pub use core::traits::{EventParser, UnifiedEvent};
+pub use factory::{EventParserFactory, Protocol};
+
+/// 宏：简化 downcast_ref 模式匹配
+/// 
+/// # 使用示例
+/// ```
+/// use sol_trade_sdk::event_parser::match_event;
+/// 
+/// match_event!(event, {
+///     PumpSwapCreatePoolEvent => |typed_event| {
+///         println!("CreatePool event: {:?}", typed_event);
+///     },
+///     PumpSwapDepositEvent => |typed_event| {
+///         // 处理存款事件
+///     },
+/// });
+/// ```
+#[macro_export]
+macro_rules! match_event {
+    ($event:expr, {
+        $($event_type:ty => $handler:expr),* $(,)?
+    }) => {
+        $(
+            if let Some(typed_event) = $event.as_any().downcast_ref::<$event_type>() {
+                $handler(typed_event.clone());
+            } else
+        )*
+        {
+            // 默认情况：什么都不做
+        }
+    };
+}
+
+// 重新导出宏以便于使用
+pub use match_event;