Make complex unique key for mem cache handler

[wonjuleee]

Summary

This PR introduces more complex unique key for video data, where video frames are extracted from an original video and these disappear media path. So I added annotation.id for the additional unique key for mem cache handler.

• Fixed failing issue during video training CVS-150481

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have ran e2e tests and there is no issues.
• I have added the description of my changes into CHANGELOG in my target branch (e.g., CHANGELOG in develop).​
• I have updated the documentation in my target branch accordingly (e.g., documentation in develop).
• I have linked related issues.

License

• I submit my code changes under the same Apache License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2024 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[chuneuny-emily]

@wonjuleee - Can you fix pre-commit issue? I'll check if this change fixes training failing issue with video input using Geti instance.

[chuneuny-emily]

@wonjuleee - I've verified it works fine even on Geti instance.

Can you update the changelog, readme and docs/release note at below location?

• https://github.com/openvinotoolkit/training_extensions/blob/releases/1.6.0/CHANGELOG.md
• https://github.com/openvinotoolkit/training_extensions/blob/releases/1.6.0/README.md
• https://github.com/openvinotoolkit/training_extensions/blob/releases/1.6.0/docs/source/guide/release_notes/index.rst