onnxruntime

Enable sorting of initializers (#14631)

Add intializers to model proto in sorted order.



### Motivation and Context
Onnxruntime OpenVino Execution Provider interacts with Openvino API by
passing onnx serialised model proto.
Current flow is that onnx serialised model proto will be passed into
Read_model() API of OpenVino that creates an OpenVino execution network
thats passed to compile_model() API.

As part of optimizations we have combined the API's (Read_model and
Compile_model) into single compile_model() API that directly accepts
serialized onnx model proto. A hash function will be computed on this
serialized input for internal Openvino optimizations. This requires the
model_proto to be deterministic during each inference requests.

With the current flow, the [initializers are added to
model_proto](https://github.com/microsoft/onnxruntime/blob/c1ff4b468dfc718f2ceb894a661d68c277cff864/onnxruntime/core/graph/graph_proto_serializer.cc#L48)
from an [unordered_map data
structure](https://github.com/microsoft/onnxruntime/blob/8ed3dfe0633f5772f1684a5c9f7e68c7acec00d2/onnxruntime/core/providers/shared_library/provider_interfaces.h#L93)
that brings in random ordering of these initializers for inference runs.


The proposed solution is to add these initializers by iterating through
a sorted[ vector consisting of the initializer
names](https://github.com/intel/onnxruntime/blob/2c7146cef879daa86336acad24810222ac25f2a9/onnxruntime/core/graph/graph_proto_serializer.cc#L49).