Create performance tests for Kotlin module

[dinomite]

There is a set of performance tests for Jackson but none of them use the Kotlin module currently.

[cowtowncoder]

@dinomite great minds etc; I was just thinking about this the other day. It might make sense to create slightly different set of tests (could still use same MediaItem) to contrast maybe "vanilla" Java with Kotlin (and maybe even Scala?), and possibly one or two other formats just as sanity checks. But not necessarily add new dimension for existing tests.
I think json backend should give a reasonable idea of differences.

Although one reason for using maybe different Bean type would be to use more varied features. Regardless, due to Kotlin's (and Scala's if included) heavier use of Creators, should probably use argument-taking constructors even if with MediaItem, to more accurately represent common usage patterns.

As a background MediaItem was used for convenience and to relate to then-popular JVM benchmark:

https://github.com/eishay/jvm-serializers

and was not necessarily designed to be particularly good value type to benchmark.

[k163377]

I will share the benchmarks I use for my experimental project(jackson-module-kogera).
This includes benchmarks for basic serialization/deserialization and the use of value class/data class/Collection.
https://github.com/ProjectMapK/kogera-benchmark