Merge pull request #17493 from TolyaTalamanov:at/python-bindings-gapi

* Implement G-API python bindings

* Fix hdr_parser

* Drop initlization with brackets using regexp

* Handle bracket initilization another way

* Add test for core operations

* Declaration and definition of View constructor now in different files

* Refactor tests

* Remove combine decorator from tests

* Fix comment to review

* Fix test

* Fix comments to review

* Remove GCompilerArgs implementation from python

Co-authored-by: Pinaev <danil.pinaev@intel.com>

modules/gapi/misc/python/pyopencv_gapi.hpp

@@ -0,0 +1,13 @@
+using gapi_GKernelPackage = cv::gapi::GKernelPackage;
+
+template<>
+bool pyopencv_to(PyObject* obj, std::vector<GCompileArg>& value, const ArgInfo& info)
+{
+    return pyopencv_to_generic_vec(obj, value, info);
+}
+
+template<>
+PyObject* pyopencv_from(const std::vector<GCompileArg>& value)
+{
+    return pyopencv_from_generic_vec(value);
+}