Transparent datasource properties suggestions

[philippotto]

@fm3 Can you double-check my small back end change please? A datastore update is needed for this, right?

• tell user that the server suggests a new datasource json. also allow to see the old version + diff
• removes the default "please review... use the advanced mode if you want to see the json" alert, since it felt a bit unnecessary to me (also, it's weird to have multiple alerts). the "simple" vs. "advanced" switch should be self-explanatory.

URL of deployed dev instance (used for testing):

• https://showdatasourcechanges.webknossos.xyz

Steps to test:

• edit a datasource properties json (e.g., remove a resolution)
• click on "refresh" on the datasets page and edit the dataset
• there should be an alert telling you that wk has inferred additional information
• clicking the links should render the old datasource-properties.json and the diff between new and old (the latter is more of a "pro feature", but I don't know if we can/should communicate this clearer)

Issues:

• contributes to WebKnossos (silently) suggests (wrong) datasource-properties.json changes #4086

---

• Updated changelog
• [ ] Updated migration guide if applicable
• Updated documentation if applicable
• Needs datastore update after deployment
• Ready for review

[fm3]

backend change LGTM :) Yes, this comes with a datastore upgrade

[daniel-wer]

Awesome, works very well and will be quite helpful! 👍

Currently it's not possible to see in the diff whether properties were added or removed, I think, and changes to objects in arrays are hard to match, because the array index is not known, BUT I think we can always optimize this later if we find that this poses problems :)