feat: add openalex validator

[mfenner]

• support W(ork), A(uthor), S(ource), I(nstitution), C(oncept), P(ublisher), or F(under)

❤️ Thank you for your contribution!

Description

Adding support for OpenAlex identifiers for W(ork), A(uthor), S(ource), I(nstitution), C(oncept), P(ublisher), or F(under) as described at https://docs.openalex.org/how-to-use-the-api/get-single-entities.

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.
• I've identified the copyright holder(s) and updated copyright headers for touched files (>15 lines contributions).
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Frontend

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[tmorrell]

Looks good. If you add one more test I think we can merge.

[tmorrell]

Could you add one more comparison test here?

[mfenner]

Added two tests for Work and Author.