Merge pull request #24584 from TolyaTalamanov:at/implement-inference-only-mode-for-ov-backend

G-API: Implement inference only mode for OV backend #24584

### Changes overview

Introduced `cv::gapi::wip::ov::benchmark_mode{}` compile argument which if enabled force `OpenVINO` backend to run only inference without populating input and copying back output tensors. 

This mode is only relevant for measuring the performance of pure inference without data transfers. Similar approach is using on OpenVINO side in `benchmark_app`: https://github.com/openvinotoolkit/openvino/blob/master/samples/cpp/benchmark_app/benchmark_app.hpp#L134-L139



### Pull Request Readiness Checklist
See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

- [x] I agree to contribute to the project under Apache 2 License.
- [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV
- [x] The PR is proposed to the proper branch
- [ ] There is a reference to the original bug report and related work
- [ ] There is accuracy test, performance test and test data in opencv_extra repository, if applicable
      Patch to opencv_extra has the same branch name.
- [x] The feature is well documented and sample code can be built with the project CMake

modules/gapi/include/opencv2/gapi/infer/ov.hpp

@@ -679,7 +679,32 @@ protected:
 };
 
 } // namespace ov
+
+namespace wip { namespace ov {
+/**
+ * @brief Ask G-API OpenVINO backend to run only inference of model provided.
+ *
+ * G-API OpenVINO backend will perform only the inference of the model provided
+ * without populating input and copying back output data.
+ * This mode is used to evaluate the pure inference performance of the model without
+ * taking into account the i/o data transfer.
+ */
+struct benchmark_mode { };
+/** @} */
+
+} // namespace ov
+} // namespace wip
+
 } // namespace gapi
+
+namespace detail
+{
+    template<> struct CompileArgTag<cv::gapi::wip::ov::benchmark_mode>
+    {
+        static const char* tag() { return "gapi.wip.ov.benchmark_mode"; }
+    };
+}
+
 } // namespace cv
 
 #endif // OPENCV_GAPI_INFER_OV_HPP