[WIP] Implement a Zotero Picker compatible CAYW Endpoint

[palukku]

Adds the ability to use the extensions which normally can be used with better-bibtex to startup the cayw zitation picker in zotero.

Closes JabRef#13187

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• [.] Change in CHANGELOG.md described in a way that is understandable for the average user (if change is visible to the user)
• [.] Tests created for changes (if applicable)
• [.] Manually tested changed features in running JabRef (always required)
• [.] Screenshots added in PR description (if change is visible to the user)
• [.] Checked developer's documentation: Is the information available and up to date? If not, I outlined it in this pull request.
• [.] Checked documentation: Is the information available and up to date? If not, I created an issue at https://github.com/JabRef/user-documentation/issues or, even better, I submitted a pull request to the documentation repository.

[subhramit]

Just to inform, I have updated one of my comments in the previous PR.

Apart from that, I see that Philip has resolved some of them already here. @palukku please be comfortable that there is no hurry - I am aware you need to go today - so invest time in packing up properly and have a safe journey :)