Auto plugin async infer request implementation (#5707)

* Async auto-request, now with revamped SetCallback (after https://github.com/openvinotoolkit/openvino/pull/5645 merged) it is safe to set.
Also test modification to verify that the callback is called on the same (user's) request and e.g. not on the actual device's request

* Override CreateInferRequestImpl() instead of CreateInferRequest()

Signed-off-by: Shoujiang Ma <shoujiang.ma@intel.com>

Co-authored-by: myshevts <maxim.y.shevtsov@intel.com>

inference-engine/include/cpp/ie_infer_request.hpp

@@ -217,6 +217,18 @@ public:
      * @return true if current InferRequest object is initialized, false - otherwise
      */
     explicit operator bool() const noexcept;
+
+    /**
+     * @brief Compares whether this request wraps the same impl underneath
+     * @return true if current InferRequest object doesn't wrap the same impl as the operator's arg
+     */
+    bool operator!=(const InferRequest&) const noexcept;
+
+    /**
+     * @brief Compares whether this request wraps the same impl underneath
+     * @return true if current InferRequest object wraps the same impl as the operator's arg
+     */
+    bool operator==(const InferRequest&) const noexcept;
 };
 
 template<>