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 parsing the escaping
3. Adapt org.jabref.model.entry.KeywordList#serialize to escape properly

Please also keep in mind that the GUI renders differently than when serializing. This should be done if steps 2 and 3 were correctly done. -- You can double check with org.jabref.gui.fieldeditors.KeywordsEditorViewModel#serializeKeywords - and simply try out at the UI.

There was code proposed multiple times - but without any timely follow-up. Please ready through and implement a good solution

• good test cases https://github.com/JabRef/jabref/pull/12888/files#diff-405010f9d24d966c1c8d319857c458e7a81761922448a5ff981e645d4ad43efc.
• Add #12810: Implement escaping for keyword separators (FKA #12888) #13583

When working on this address #12888 (comment)