Introduce an api to query the microtask autorun state of an isolate

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index d39dca96bba8d5b60f46d0ec2e05f616cf71cd0e..809ac1325eb5439b533933d3adf042f809315e4a 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -4389,6 +4389,12 @@ class V8_EXPORT Isolate {
    */
   void SetAutorunMicrotasks(bool autorun);
 
+  /**
+   * Experimental: Returns whether the Microtask Work Queue is automatically
+   * run when the script call depth decrements to zero.
+   */
+  bool WillAutorunMicrotasks() const;
+
  private:
   template<class K, class V, class Traits> friend class PersistentValueMap;