[flagd-provider] package-private interface prevents resolverType option usage with Kotlin

[detached]

The EvaluatorType in flagd-providers Config.java is package private.

A bug in Kotlin prevents the usage of the public enum Config.Resolver as it implements the package private interface: https://youtrack.jetbrains.com/issue/KT-11700

Due to this bug the code

    fun getFlagdProvider(): FlagdProvider = FlagdProvider(
        FlagdOptions.builder()
            .resolverType(Config.Resolver.IN_PROCESS)
            .build()
    )

throws an IllegalAccessError at runtime with the cause

Caused by: java.lang.IllegalAccessError: failed to access class dev.openfeature.contrib.providers.flagd.Config$EvaluatorType from class x.y.z.MyClass (dev.openfeature.contrib.providers.flagd.Config$EvaluatorType and x.y.z.MyClass are in unnamed module of loader 'app')