Read outlines or masks from segmentation_file_regex parameter

[d33bs]

Description

This PR adds a new parameter to CytoDataFrame: segmentation_file_regex. This parameter assists users in associating masks or outline files with original images where they may otherwise have different naming conventions. When segmentation_file_regex is None we fall back to the original capability, gracefully seeking files which match the original filenames.

Thanks for any feedback!

Closes #22

What kind of change(s) are included?

• Documentation (changes docs or other related content)
• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (these changes would cause existing functionality to not work as expected).

Checklist

Please ensure that all boxes are checked before indicating that this pull request is ready for review.

• I have read and followed the CONTRIBUTING.md guidelines.
• I have searched for existing content to ensure this is not a duplicate.
• I have performed a self-review of these additions (including spelling, grammar, and related).
• These changes pass all pre-commit checks.
• I have added comments to my code to help provide understanding
• I have added a test which covers the code changes found within this PR
• I have deleted all non-relevant text in this pull request template.

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[jenna-tomkinson]

LGTM! I have a minor comment about how the new ALSF example looks and that some of the other examples look a bit funky. Maybe we can talk in person about it! Other than that, code looks pretty sound to me!

[d33bs]

Thanks @jenna-tomkinson ! I created #28 to help address the image darkness issue and plan to meet up with you to discuss more.