feat(contacts): support pronouns property

[xhon-pelushi]

Summary

• Add RFC 9554 PRONOUNS as a repeatable text contact property.
• Include it in lightweight CardDAV property fetches and cover serialization with Jest.

Closes #5108

Test plan

• Jest: rfcProps + contact model tests
• npm run build
• UI: add/edit pronouns on a contact and verify round-trip save/reload

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[github-actions]

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[GVodyanov]

@hamza221 This respects the RFC right? Because code looks good

[EnbyAce]

I think it respects the RFC, based on the changes to the tests/javascript/models/rfcProps.test.js file. The pronouns field should match PRONOUNS:they/them exactly, which does respect RFC 9554.

I don't know how Nextcloud's Contacts app serializes the properties, but RFC9554 also mentions some optional parameters that don't seem to be mentioned anywhere in the commit:

• LANGUAGE
• PREF
• TYPE
• ALTID