Provide the ability to validate a source by performing baseline checks

[pauby]

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Is Your Feature Request Related To A Problem? Please describe.

The idea for this came from this comment.

Describe The Solution. Why is it needed?

Being able to check a source against a set of baseline checks would be useful, and to see the results. It would allow end-users to add a source and run some checks to make sure it's valid (or, do it as the source is added). Currently, if you want to check a source, you'll run a search or an installation against it.

We would need to determine what "baseline" means and what checks to perform. As an example, we could:

1. Check if it's reachable. Is the URL correct?
2. What type of source is it: v2 oData, v3 JSON, local folder / shared drive, etc.
3. If authentication is provided, can we authenticate?
4. Does it have a search endpoint?

Additional Context

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