Kotlin enum values not visible at runtime

[vmutafov]

A bug was introduced in 6.3.0 regarding the support of Kotlin enums.
The bug was caused by the not correct gathering of bytecode fields. Only the @JvmField annotated fields and the Companion field were collected in the Metadata Generator. This resulted in enum values not being visible at runtime through JS/TS.

The metadata collection was and still is quite independent in regards to parsing Java/Kotlin originating classes. Because of that, the bug was only for Kotlin enums - and not for Java ones.