Merge pull request #18762 from TolyaTalamanov:at/support-garray

[G-API] Wrap GArray

* Wrap GArray for output

* Collect in/out info in graph

* Add imgproc tests

* Add cv::Point2f

* Update test_gapi_imgproc.py

* Fix comments to review

modules/gapi/misc/python/shadow_gapi.hpp

@@ -16,6 +16,8 @@ namespace cv
    class GAPI_EXPORTS_W_SIMPLE GRunArg { };
    class GAPI_EXPORTS_W_SIMPLE GMetaArg { };
 
+   class GAPI_EXPORTS_W_SIMPLE GArrayP2f { };
+
    using GProtoInputArgs  = GIOProtoArgs<In_Tag>;
    using GProtoOutputArgs = GIOProtoArgs<Out_Tag>;