onnxruntime

af205c2b - [EP ABI] Add documentation for OrtValue and ort_graph_to_proto util (#25411)

[EP ABI] Add documentation for OrtValue and ort_graph_to_proto util (#25411) ### Description - Adds documentation to state that the data pointer for an `OrtValue` owned by an `OrtGraph` is stable during the lifetime of the `OrtSession` that owns the `OrtGraph`. - Adds documentation to the ort_graph_to_proto.h utils to show how to create a `onnx::GraphProto` with external initializers that actually point to in-memory data (same approach used internally within ORT). ### Motivation and Context Clarification of usage of new graph apis.