Merge pull request #25791 from ujjayant-kadian:uk/extend-gapi-onnx-params-arbitrary-session-options

Extending G-API onnx::Params to pass arbitrary session options #25791

### Pull Request Readiness Checklist

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

- [ ] I agree to contribute to the project under Apache 2 License.
- [ ] 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
- [ ] 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.
- [ ] The feature is well documented and sample code can be built with the project CMake

modules/gapi/src/backends/onnx/bindings_onnx.cpp

@@ -57,6 +57,12 @@ cv::gapi::onnx::PyParams::cfgDisableMemPattern() {
     return *this;
 }
 
+cv::gapi::onnx::PyParams&
+cv::gapi::onnx::PyParams::cfgSessionOptions(const std::map<std::string, std::string>& options) {
+    m_priv->cfgSessionOptions(options);
+    return *this;
+}
+
 cv::gapi::GBackend cv::gapi::onnx::PyParams::backend() const {
     return m_priv->backend();
 }

modules/gapi/src/backends/onnx/gonnxbackend.cpp

@@ -702,6 +702,10 @@ ONNXCompiled::ONNXCompiled(const gapi::onnx::detail::ParamDesc &pp)
         cv::gimpl::onnx::addExecutionProvider(&session_options, ep);
     }
 
+    for (const auto &option : pp.session_options) {
+        session_options.AddConfigEntry(option.first.c_str(), option.second.c_str());
+    }
+
     if (pp.disable_mem_pattern) {
         session_options.DisableMemPattern();
     }