Convert `AnomalyMapGenerator` to `nn.Module`

[samet-akcay]

Description

• This refactor converts AnomalyMapGenerator to nn.Module

Changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] 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

• [ ] 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