Add NREL Siting Lab dataset archiver

[e-belfer]

Overview

Closes #584

What problem does this address?

• Add an archiver to grab all NREL siting data. The links on the main page are dynamically generated through Javascript, so we POST to the API to get them before looping through each page and archiving the data. We end up with one zip file per dataset.

What did you change in this PR?

• Added the archiver and the archiver source metadata

Questions for the reviewer:

• I've left working_partitions blank in the datapackage.json file because I dynamically generate all the URLs. Is this a problem if we aren't planning to access the data through our datastore?

Testing

How did you make sure this worked? How can a reviewer verify this?
https://github.com/catalyst-cooperative/pudl-archiver/actions/runs/13296766499

To-do list

Tasks

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1. Debug missing 87843.pdf file!
2. Check on links with spaces
3. Spot check for missing files
4. Update relevant documentation - like comments, docstrings, README, release notes, etc.
5. Review the PR yourself and call out any questions or issues you have