Disambiguate the winml OrtModel with the model editing API OrtModel. (microsoft#24474)

### Description
<!-- Describe your changes. -->
Use a pimpl-esque approach so that the winml OrtModel type doesn't
conflict with the model editing API OrtModel.


### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Fix crash due to linker calling the incorrect destructor when there are
two different OrtModel types in the global namespace.

Author: skottmckay

onnxruntime/core/framework/tensor_type_and_shape.cc

@@ -226,8 +226,6 @@ std::unique_ptr<OrtTensorTypeAndShapeInfo> OrtTensorTypeAndShapeInfo::GetTensorS
   if (dim_params != nullptr) {
     type_and_shape->dim_params = *dim_params;
   } else {
-    // we expect to be being called with a concrete shape so validate that
-    assert(type_and_shape->shape.Size() >= 0);
     type_and_shape->dim_params.resize(type_and_shape->shape.NumDimensions(), "");
   }