[feat] Added Kotlinx Serialization support

[ctasada]

Added basic support for KotlinX Serialization classes.

This new module serializes Kotlin @Serializable classes respecting the @SerialName annotation and types.

Solves #589

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[timonback]

I like this implementation as it is a lot more compact and an add-on module seems appropriate.

Can you add a (small) test case for useFqn=true (the name field is sufficient)?

[ctasada]

@timonback done.

I will keep iterating over next PRs, but I think it's good enough to go, at least as a beta

[sam0r040]

Hi @ctasada,

we had a look at the changes and like it a lot more than the one that you have shown us before. We like to see:

• More simplified code by using more Kotlin features unless we missed something
• More fine grained and isolated test cases that make understanding and debugging easier

We created ctasada#3 as as suggestion for both and postpone the release till Wednesday (27.3.) to give you some time to review the suggestion. Tests can be refactored later, but we would like to make the production code simpler.

From our side it would be sufficient to just merge the PR ctasada#3 and then we can merge this PR without the need for further changes for the march release.

[ctasada]

@sam0r040 @timonback I merged the suggested improvements, fixed the byte bug and refactor the tests a bit.

Hopefully we are good to go

[timonback]

Looks great @ctasada and looking forward to the next improvement to move it beyond the beta status.