added open fast trace requirements for backend search

[Bronterrzel]

Open Fast Trace style requirements write up for backend search. As part of my bachelor's thesis.

Feedback or additional requirements i missed is appreciated.

Mandatory checks

• I own the copyright of the code submitted and I license it under the MIT license
• [/] I manually tested my changes in running JabRef (always required)
• [/] I added JUnit tests for changes (if applicable)
• [/] I added screenshots in the PR description (if change is visible to the user)
• [/] I described the change in CHANGELOG.md in a way that is understandable for the average user (if change is visible to the user)
• [/] I checked the user 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 updating file(s) in https://github.com/JabRef/user-documentation/tree/main/en.

[palukku]

Looks like you forgot to add your changes to the commit (besides the submodules as already mentioned by the bot)?

[koppor]

Pleaee also include #840

[trag-bot]

@trag-bot didn't find any issues in the code! ✅✨

[jabref-machine]

Your pull request needs to link an issue correctly.

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[koppor]

This is covered by req~backend-search.field-search.pseudo-fields~1. Can be linked.