add interface to provide jse

doric-android/doric/src/main/java/pub/doric/DoricNativeDriver.java

@@ -228,4 +228,8 @@ public class DoricNativeDriver implements IDoricDriver {
         }
         mJSHandler = doricJSEngine.getJSHandler();
     }
+
+    public DoricJSEngine getDoricJSEngine() {
+        return doricJSEngine;
+    }
 }

doric-android/doric/src/main/java/pub/doric/engine/DoricJSEngine.java

@@ -351,4 +351,8 @@ public class DoricJSEngine implements Handler.Callback, DoricTimerExtension.Time
                 break;
         }
     }
+
+    public IDoricJSE getDoricJSE() {
+        return mDoricJSE;
+    }
 }

doric-android/doric/src/main/java/pub/doric/engine/DoricNativeJSExecutor.java

@@ -63,4 +63,8 @@ public class DoricNativeJSExecutor implements IDoricJSE {
     public void teardown() {
         mJSExecutor.destroy();
     }
+
+    public JSExecutor getJSExecutor() {
+        return mJSExecutor;
+    }
 }