Merge pull request #25709 from dkurt:wrap_addLayer

* Wrap dnn addLayer
* Add typing stubs

modules/dnn/misc/python/pyopencv_dnn.hpp

@@ -71,6 +71,22 @@ PyObject* pyopencv_from(const dnn::LayerParams& lp)
     return dict;
 }
 
+template<>
+bool pyopencv_to(PyObject *o, dnn::LayerParams &lp, const ArgInfo& info)
+{
+    CV_Assert(PyDict_Check(o));
+    PyObject *key, *value;
+    Py_ssize_t pos = 0;
+    std::string keyName;
+    while (PyDict_Next(o, &pos, &key, &value)) {
+        getUnicodeString(key, keyName);
+        dnn::DictValue dv;
+        pyopencv_to(value, dv, info);
+        lp.set(keyName, dv);
+    }
+    return true;
+}
+
 template<>
 PyObject* pyopencv_from(const std::vector<dnn::Target> &t)
 {