Upgrade to ONNX 1.14.0

[hamptonm1]

The new features are as follows:

New Operator:
DeformConv

Operator extensions:
Equal - Support for string data type added in onnx/onnx#4828
AveragePool - New attribute dilations onnx/onnx#4790
Pad - Added new wrap to the mode attribute to support circular padding onnx/onnx#4793
onnx/onnx#4862 - Added half_pixel_symmetric to the coordinate_transformation_mode attribute onnx/onnx#4862

Backend Tests
Replaced real models with light models in backend tests.

Depreciation as of now:
Python 3.7 support will be deprecated due to EOL in next release: onnx/onnx#5191
onnx-weekly package will be deprecated in TestPyPI. Please use them from PyPI instead: onnx/onnx#4930
Properties in FormalParameter will be deprecated in future release. Please use newer properties name: onnx/onnx#5074
Variables from mapping.py will be deprecated and become private implementation details. Please use public functions to get corresponding types from helper.py instead: onnx/onnx#4554

[hamptonm1]

@AlexandreEichenberger @tungld @chentong319 I know Philip mentioned the backend tests replacement in another issue but if this is the standard going forward....should we rip the band-aid off to speak and actually move forward with the upgrade of ONNX 1.14.0. Especially if we want to integrate Opset 19. I can start this off and see how things go based on my experience with upgrading ONNX in the past. It does not seem like anyone else was taking this on from the issues posted.