Add XAI hook for Mask-RCNN

[GalyaZalesskaya]

Summary

Added algorithm for Mask RCNN saliency generation using predicted masks in model's outputs.

Added dummy MaskRCNNRecordingForwardHook to save logic with hooks for all XAI algorithms, but the main saliency map generation is happening in MaskRCNNRecordingForwardHook.get_sal_map_from_preds class method

TODO for future PRs:

• Current masks from Mask RCNN are wrong and the reason needs to be investigated

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added e2e tests for validation.
• 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) 2023 Intel Corporation
# SPDX-License-Identifier: Apache-2.0

[negvet]

You will add tests when mask-rcnn predictions will be fixed?

[GalyaZalesskaya]

You will add tests when mask-rcnn predictions will be fixed?

I wanted to add unit tests with simple shape checks in a separate PR , but I can do it now, it's even better