Migrate JsonEncoder/Decoder macro to Scala 3 native macro. No more magnolia

[987Nabil]

• annotation handling
• decoders for recursive data structures

[987Nabil]

Still needs some refactoring. But it would be nice, if one could approve the workflows.

[987Nabil]

The macro basically inlines the code that calls this apply. Therefore we get a compile time error if it is package private.

[987Nabil]

I thought one could extract the common macro code to some helper. But this does not seem to work since the imports of the using Quotes are path dependent. So I guess this is ready for review.

[jdegoes]

@987Nabil Looks great! Can you add some more tests for this under Scala 3 so we can be more assured the derivation is working correctly?

[987Nabil]

There are actually a lot of shared tests. I think most cases are covered. But I can take a look if I find something missing.
Do you have something particular in mind?

[plokhotnyuk]

@987Nabil Using this benchmark set you can test both correctness and performance of the new way of derivation on ~60 synthetic and real-world JSON samples.

[987Nabil]

fyi: The benchmark does not compile. Did not find the time yet to take a deeper look.