Implement escaping for keyword separators

[koppor]

Context: #12532 (comment)

JabRef does not support \ to be used as escaping for the keyword separator

Task:

1. Add test cases for \, in org.jabref.model.entry.KeywordListTest
2. Adapt org.jabref.model.entry.KeywordList#parse(java.lang.String, java.lang.Character, java.lang.Character) to implement the escaping

[krishnagjsForGit]

Hi, I am new to Opensource. I want to start my work on this. Can I work on this?

[krishnagjsForGit]

/assign-me

[github-actions]

👋 Hey @krishnagjsForGit, thank you for your interest in this issue! 🎉

We're excited to have you on board. Start by exploring our Contributing guidelines, and don't forget to check out our workspace setup guidelines to get started smoothly.

In case you encounter failing tests during development, please check our developer FAQs!

Having any questions or issues? Feel free to ask here on GitHub. Need help setting up your local workspace? Join the conversation on JabRef's Gitter chat. And don't hesitate to open a (draft) pull request early on to show the direction it is heading towards. This way, you will receive valuable feedback.

Happy coding! 🚀

⏳ Please note, you will be automatically unassigned if there is not a (draft) pull request within 14 days (by 07 April 2025).

[krishnagjsForGit]

Kindly Find the PR : krishnagjsForGit#1