Interceptor clear (#4248)

* Adding interceptor clearing

* Fixing spacing

* changed clear to empty array

* fixed interceptor clear test

Co-authored-by: Andrew <Andrew@Andrews-MacBook-Pro.local>
Co-authored-by: Jay <jasonsaayman@gmail.com>

lib/core/InterceptorManager.js

@@ -35,6 +35,15 @@ InterceptorManager.prototype.eject = function eject(id) {
   }
 };
 
+/**
+ * Clear all interceptors from the stack
+ */
+InterceptorManager.prototype.clear = function clear() {
+  if (this.handlers) {
+    this.handlers = [];
+  }
+};
+
 /**
  * Iterate over all the registered interceptors
  *