Documentation/tests for Java records support

[ErwinOlieAlliander]

It looks like mappie supports mapping from Java record types, but it isn't documented and neither protected by testcases.

public record JavaClass(String value) { }

import tech.mappie.api.ObjectMappie

data class KotlinClass(val value: String)

object Mapper : ObjectMappie<JavaClass, KotlinClass>() {
    override fun map(from: JavaClass) = mapping {
        to::value fromValue from.value!!
    }
}

fun main() {
    println(Mapper.map(JavaClass("value")).value)
}

[stefankoppier]

Thanks for the report. There was actually a bug with Java records. The PR fixes those :)