Add ensembling methods for tiling to Anomalib

[blaz-r]

Description

This PR adds mechanism to train ensemble of models on tiled images. It is part of Google Summer of Code.

A lot of details on implementation as well as discussion can be accessed in #1131.

Closes #1727

Changes

• Bug fix (non-breaking change which fixes an issue)
• Refactor (non-breaking change which refactors the code base)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist

Some things still todo (tests, docs...) but most of the code is ready for review.

• My code follows the pre-commit style and check guidelines of this project.
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing tests pass locally with my changes
• I have added a summary of my changes to the CHANGELOG (not for minor changes, docs and tests).

[blaz-r]

The code and test are now refactored. I'll go over the docs again tomorrow and polish them some more.

The PR still relies on #2350 to be fixed and I guess I'll just use the workaround for #2254. I'm also not sure about the DCO, will rebasing mess anything up?

[samet-akcay]

The code and test are now refactored. I'll go over the docs again tomorrow and polish them some more.

The PR still relies on #2350 to be fixed and I guess I'll just use the workaround for #2254. I'm also not sure about the DCO, will rebasing mess anything up?

Thanks @blaz-r. Not sure about #2350, we need to discuss. Concerning DCO, that's fine, you could just click the link and sign it