tests for ListIdentifiers implementation are running.

[wgresshoff]

❤️ Thank you for your contribution!

Description

As follow-up for the first PR where the ListRecords based method was implemented, now the missing ListIdentifiers based approach is added. This should avoid time outs with outdated resumption tokens.

Checklist

Ticks in all boxes and 🟢 on all GitHub actions status checks are required to merge:

• I'm aware of the code of conduct.
• I've created logical separate commits and followed the commit message format.
• I've added relevant test cases.
• I've added relevant documentation.
• I've marked translation strings.
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[tmorrell]

Looks good, one small question

[tmorrell]

Are there other verbs folks might use? Should there be an error that they aren't implemented?

[wgresshoff]

I see your point, because the design follows the verbs that are defined by OAI-PMH. I chose them to offer familiar terms to the admins and wasn't aware of the drawback. But the usage is safe in the sense you can put in every verb you like and the harvester does it's work (perhaps in a way the suer doesn't expect).