append/prepend_view_path support in actions

[qpSHiNqp]

Added support for runtime append_view_path and prepend_view_path instance methods in controllers.

So far, _xray_bar.html.erb partial have been raising ActionView::MissingTemplate if you call append_view_path or prepend_view_path in your controllers' action, because lookup_context in that partial doesn't take over its view_paths from your controllers' action view.

We added additional view paths to Xray.request_info struct using monkeypatch, and now you can use append_view_path and prepend_view_path in your application.