Refactor XAI data entities

[vinnamkim]

Summary

• Ticket no. 135930
• This PR aims to remove *PredEntityWithXAI and merge the fields owned by it into *PredEntity.
• It is because it doubles the number of entities in the data entity codebase and makes OTXModel’s generic typing too complicated.

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

[codecov]

Codecov Report

Attention: Patch coverage is 59.82143% with 45 lines in your changes are missing coverage. Please review.

Project coverage is 71.37%. Comparing base (9a47ee8) to head (a4b7552).

Files	Patch %	Lines
src/otx/core/model/classification.py	33.33%	6 Missing ⚠️
src/otx/core/data/entity/anomaly/classification.py	0.00%	4 Missing ⚠️
src/otx/core/data/entity/anomaly/detection.py	0.00%	4 Missing ⚠️
src/otx/core/data/entity/anomaly/segmentation.py	0.00%	4 Missing ⚠️
src/otx/core/data/entity/action_detection.py	0.00%	3 Missing ⚠️
src/otx/core/data/transform_libs/torchvision.py	0.00%	3 Missing ⚠️
src/otx/core/data/dataset/visual_prompting.py	50.00%	2 Missing ⚠️
src/otx/core/data/entity/base.py	90.00%	2 Missing ⚠️
src/otx/core/data/entity/classification.py	75.00%	2 Missing ⚠️
src/otx/core/data/entity/visual_prompting.py	60.00%	2 Missing ⚠️
... and 10 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3230      +/-   ##
===========================================
+ Coverage    71.25%   71.37%   +0.12%     
===========================================
  Files          178      178              
  Lines        15162    15092      -70     
===========================================
- Hits         10803    10772      -31     
+ Misses        4359     4320      -39     

Flag	Coverage Δ
py310	71.34% <59.82%> (+0.11%)	⬆️
py311	71.37% <59.82%> (+0.12%)	⬆️

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[harimkang]

LGTM

[GalyaZalesskaya]

Thank you for this great update that will help us :)