Support Citation File Format (CFF, yaml) as export format

[koppor]

TLDR: JabRef has the functionality to import CFF (#7945), but no functionality for export. This should be implemented.

JabRef should be able to parse Citation File Format (CFF) and export into it.

Links:

• General CFF information: https://citation-file-format.github.io/
• Mapping BibTeX and CFF: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-citation-files#citing-something-other-than-software
• Python implementation of a converter: https://github.com/citation-file-format/cff-converter-python
• Description of the BibTeX format: https://docs.jabref.org/advanced/fields

Implementation hints:

The export can either be done by Java code directly or creating .layout files.

Export using .layout files:

See yaml.* in https://github.com/JabRef/jabref/tree/main/src/main/resources/resource/layout

Example: https://github.com/JabRef/jabref/blob/main/src/main/resources/resource/layout/yaml.layout

Documentation on .layout files: https://docs.jabref.org/collaborative-work/export/customexports

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Acceptance criteria:

• At least @article and @inproceedings need to be supported.

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Note: If you dislike the .layout format, one can work on replacing that part of JabRef by Java templating engines. See koppor#392 for details.

[Siedlerchr]

Duplicate of #10661