Add configuration options to PostProcessor

[djdameln]

📝 Description

This PR adds configuration options to the OneClassPostProcessor class.

✨ Changes

• Adds enable_thresholding and enable_normalization arguments and corresponding logic to OneClassPostProcessor.
• Adds enable_threshold_matching argument, which determines if the post-processor should use the image threshold for pixel-level predictions when the pixel-threshold is not available, and vice-versa.
• Minor simplification in sensitivity logic: Use 0.5 value as default instead of None
• Adds unit tests for OneClassPostProcessor class.

Select what type of change your PR is:

• 🐞 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)
• 📚 Documentation update
• 🔒 Security update

✅ Checklist

Before you submit your pull request, please make sure you have completed the following steps:

• 📋 I have summarized my changes in the CHANGELOG and followed the guidelines for my type of change (skip for minor changes, documentation updates, and test enhancements).
• 📚 I have made the necessary updates to the documentation (if applicable).
• 🧪 I have written tests that support my changes and prove that my fix is effective or my feature works (if applicable).

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