work on integrating new system

apps/stock/core/src/backtest/mod.rs

@@ -109,4 +109,8 @@ impl EventQueue {
     pub fn len(&self) -> usize {
         self.events.len()
     }
+    
+    pub fn peek_next(&self) -> Option<&BacktestEvent> {
+        self.events.front()
+    }
 }