[DRAFT] update_file with difflib

[Boostrix]

#3643 (update_file with diff support):

Background

Changes

Documentation

Test Plan

PR Quality Checklist

• [ ] My pull request is atomic and focuses on a single change.
• [ ] I have thoroughly tested my changes with multiple different prompts.
• [ ] I have considered potential risks and mitigations for my changes.
• [ ] I have documented my changes clearly and comprehensively.
• [ ] I have not snuck in any "extra" small tweaks changes

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			May 10, 2023 1:00pm

[ntindle]

Why draft?

[Boostrix]

Depended on something under review and would be up to people if it's useful as is or not - personally just found it easier to visualize changes that way.

Could / should probably make this a config option so that this can be enabled / disabled like people prefer

[github-actions[bot]]

This pull request has conflicts with the base branch, please resolve those so we can evaluate the pull request.

[Pwuts]

Not applicable at this time, but possibly interesting in the future. Labeled with fridge and closing for now. :)