[ONNX] Translate ONNX metadata with delegate

[mvafin]

Details:

• Translate ONNX metadata with delegate

Tickets:

• ticket-id

[Copilot]

Pull Request Overview

This PR implements ONNX metadata translation with delegate by adding metadata extraction and propagation functionality to the ONNX frontend. The changes enable the retrieval of metadata from ONNX models and its translation into OpenVINO's runtime information system.

• Added virtual get_metadata() method to the GraphIterator interface
• Implemented metadata extraction from ONNX protobuf models
• Integrated metadata propagation into the translation session to set runtime info on the OpenVINO model

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/frontends/onnx/frontend/include/openvino/frontend/onnx/graph_iterator.hpp	Adds virtual get_metadata() method to base GraphIterator interface
src/frontends/onnx/frontend/src/core/graph_iterator_proto.hpp	Declares get_metadata() override in GraphIteratorProto class
src/frontends/onnx/frontend/src/core/graph_iterator_proto.cpp	Implements metadata extraction from ONNX protobuf model properties
src/frontends/onnx/frontend/src/input_model.hpp	Adds get_metadata() method declaration to InputModel
src/frontends/onnx/frontend/src/input_model.cpp	Implements metadata storage and retrieval in InputModel implementation
src/frontends/onnx/frontend/src/translate_session.cpp	Integrates metadata into OpenVINO model as runtime info under framework section
src/frontends/onnx/tests/graph_iterator.cpp	Adds empty get_metadata() implementation to test SimpleIterator class

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