[Feature] add support for kotlinx.serialization as JsonMapper

[gmariotti]

Is your feature request related to a problem? Please describe.
With kotlinx.serialization gaining popularity in the Kotlin space, it would be great to have it as a JsonMapper option in JobRunr and avoid the need to have different type of json libraries in the same project.

Describe the solution you'd like
A configurable JsonMapper that uses kotlinx.serialization is added to JobRunr core or language-support.

Describe alternatives you've considered
The only alternative would be to develop it as a separate project, independent of JobRunr.

Additional context
If it's okay to have it in JobRunr, I'm open to creating a PR for it.

[rdehuyss]

Hi @gmariotti , we're definitely open for PR's. The only important thing to keep in mind is to make sure there are some tests.

[gmariotti]

Thanks for the fast answer @rdehuyss 🙏 in which module should I develop it? In core, like the other mappers, or in language-support?

[rdehuyss]

I would do it in the language-support module for kotlin 1.9 as it will only be relevant for Kotlin.. If you add a test that extends the Java AbstractJsonMapperTest, I think we're ok (the AbstractJsonMapperTest may have to move to TestFixtures though).

[rdehuyss]

Please also use the v7 branch for your work as we're about to release the first v7 release candidate.

[alexanderpichler-cpi]

@gmariotti I can help you if you want

[gmariotti]

@alexanderpichler-cpi I'm hoping to get back to it this weekend, but if I don't, I'll let you know