Add Collection of Comp Sci Bibliographies fetcher

[daniel-price]

Fixes #6638

• Change in CHANGELOG.md described (if applicable)
• Tests created for changes (if applicable)
• Manually tested changed features in running JabRef (always required)
• Screenshots added in PR description (for UI changes)
• Checked documentation: Is the information available and up to date? If not created an issue at https://github.com/JabRef/user-documentation/issues or, even better, submitted a pull request to the documentation repository.

[koppor]

Thank you for working on this. It is a tough task since JabRef focuses on high code quality AND on high quality of BibTeX entries (as much as work should be done by JabRef automatically; the user should not be forced to spend any time to improve the quality of the BibTeX entries).

Thus, I gave two kinds of comments:

• nitpicks to the code style
• questions to the fetcher logic. Especially, because a) not all fields available are returned and b) dblp offers a BibTeX result (and it was not clear to my why this result is not used).

[koppor]

I like the added test.

Unfortunately, it shows that the abstract has some unnecessary whitespace. Could you maybe adress this?

[koppor]

That was fast - thank you. Little nitpick remaining 😇

[koppor]

LGTM 👍. The changes added require second review and thus this PR awaits a second review.

[Siedlerchr]

Thanks for your contribution! It would be nice if you could add some short documentation for the new formatters and the new fetcher to the help pages

[koppor]

Help page for formatters: https://github.com/JabRef/user-documentation/blob/master/en/finding-sorting-and-cleaning-entries/cleanupentries.md --> https://github.com/JabRef/user-documentation/blob/master/en/advanced/saveactions.md

Help page for fetchers: https://github.com/JabRef/user-documentation/tree/master/en/collect/import-using-online-bibliographic-database

[daniel-price]

Yep I'll add to the documentation!