Replace swashbuckle swagger gen with openapi

[JustArchi]

Checklist

• [X] I read and understood ASF's Contributing guidelines
• [X] I also read Setting-up and FAQ, I don't need help, this is an enhancement idea
• [X] This is not a duplicate of an existing issue
• [X] My idea doesn't duplicate existing ASF functionality described on the wiki
• [X] I believe that my idea falls into ASF's scope and should be offered as part of ASF built-in functionality
• [X] My idea doesn't violate the Steam Subscriber Agreement
• [X] My idea doesn't violate the Steam Online Conduct
• [X] This is not ASF-ui suggestion

Enhancement purpose

Already tested in ASFB and my other projects, it seems good enough to consider it, although breaking changes are expected and needs to be evaluated before.

Might be a good idea to postpone it until at least V6.1.1.0, so the .NET 9 release can go smoother than dumping everything at once.

Solution

-

Why currently available solutions are not sufficient?

-

Can you help us with this enhancement idea?

Yes, I can code the solution myself and send a pull request

Additional info

No response