Add Java serializable support for JVM

With K2 this is possible again.

Common
```kt
expect interface JavaSerializable

data class Post(val name: String) : JavaSerializable
```
JVM

```kt
actual interface JavaSerializable: java.io.Serializable

fun main() {
    val post = Post("Hello")
    println(post)
    println(post is java.io.Serializable) // True
}
```