refactor: simplify event API method names for better ergonomics

- Rename verbose method names to shorter, clearer alternatives
- program_received_time_us() → recv_us()
- program_handle_time_consuming_us() → handle_us()
- instruction_outer_index() → outer_index()
- instruction_inner_index() → inner_index()
- Update all implementations across event parsers and processors

Improves developer experience while maintaining semantic clarity.

src/main.rs

@@ -196,7 +196,7 @@ fn create_event_callback() -> impl Fn(Box<dyn UnifiedEvent>) {
         match_event!(event, {
             // -------------------------- block meta -----------------------
             BlockMetaEvent => |e: BlockMetaEvent| {
-                println!("BlockMetaEvent: {:?}", e.metadata.program_handle_time_consuming_us);
+                println!("BlockMetaEvent: {:?}", e.metadata.handle_us);
             },
             // -------------------------- bonk -----------------------
             BonkPoolCreateEvent => |e: BonkPoolCreateEvent| {