basic retrieval endpoint on collaboration server

[dblatcher]

What does this change?

1. add database methods for fetching a list of document Id's and fetching the steps for a particular document
2. adds routes for the methods

The functionality is very basic - more of a starting point and a way to see the our edits locally. In production, we may need to add pagination to the results.

How to test

Run locally. Go to https://editorial-collaboration.local.dev-gutools.co.uk/documents (on a browser with auth cookies) to see the list of ids of documents in your local collaboration db .

Pick one of the id's and go to https://editorial-collaboration.local.dev-gutools.co.uk/documents/{id} to see a list of steps and timestamps for that document.

How can we measure success?

Have we considered potential risks?

Safe at this point as not used in production.

[github-actions]

Deploy build 108 of Editorial Tools::Editorial Collaboration to CODE

All deployment options

• Deploy build 108 of Editorial Tools::Editorial Collaboration to CODE
• Deploy parts of build 108 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.