onnxruntime

[TensorRT EP] Refactor OrtTensorRTProviderOptions initialization and make it easy to add new field (#17617)

Two major modifications of this PR:

1. Refactor OrtTensorRTProviderOptions initialization and make it easy
to add new field.
2. Make Python API capable of using TensorRT plugins by adding new
Python binding api `register_tensorrt_plugins_as_custom_ops`. (It needs
to register ep's custom op domain before model load. For C++ API, it's
slightly different, when calling
SessionOptionsAppendExecutionProvider_TensorRT_XX, it appends cutom op
domain to session option. Later ORT can register custom op domain from
session option before model loading)