Add kotlin.serialization implementation of Serializer

[hiddewie]

This PR adds support for Kotlin serialization, see issue #13.

This PR includes #120 (this is required in order to use the stable version of kotlin.serialization).

In summary:

• Adds a class KotlinSerializer which implements Axon Serializer.
• Configurable RevisionResolver, Converter, and Json, with the same defaults as the Jackson serializer implementation.
• Because Json is configurable, applications can define how JSON should be serialized based on business requirements.
• Adds a DSL function kotlinSerializer to create a KotlinSerializer with configuration options.
• Useful errors when the .serializer() method cannot be found on a companion object of a to-serialize object.
• Class -> KSerializer is cached for performance and to avoid too much reflection.
• Simple test to show that the implementation works.

Ref https://kotlinlang.org/docs/serialization.html with basic overview.
Ref https://github.com/Kotlin/kotlinx.serialization/blob/master/docs/serialization-guide.md with serialization guide.

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[sandjelkovic]

Hey @hiddewie, thanks for this PR! There are a couple of things that should be changed but otherwise looks good

[hiddewie]

I had to recreate the PR in #124 because I deleted by Github fork, and when I re-forked this PR could still not be updated...