Add Python wrapper for Metal image handler creation (AcademySoftwareFoundation#2855)

There is no way to create an image handler in Python for MSL as there is no API exposed wrapper. This change adds in the wrapper on MslRenderer to allow image support.

Author: kwokcb

source/PyMaterialX/PyMaterialXRenderMsl/PyMslRenderer.mm

@@ -16,6 +16,7 @@ void bindPyMslRenderer(py::module& mod)
     py::class_<mx::MslRenderer, mx::ShaderRenderer, mx::MslRendererPtr>(mod, "MslRenderer")
         .def_static("create", &mx::MslRenderer::create)
         .def("initialize", &mx::MslRenderer::initialize, py::arg("renderContextHandle") = nullptr)
+        .def("createImageHandler", &mx::MslRenderer::createImageHandler)
         .def("createProgram", static_cast<void (mx::MslRenderer::*)(const mx::ShaderPtr)>(&mx::MslRenderer::createProgram))
         .def("createProgram", static_cast<void (mx::MslRenderer::*)(const mx::MslRenderer::StageMap&)>(&mx::MslRenderer::createProgram))
         .def("validateInputs", &mx::MslRenderer::validateInputs)