Migrate to stable unsigned arrays

[TheMrMilchmann]

Currently, this project uses UByteArrays extensively even though they are still marked experimental in the current Kotlin version. This is a blocker for a stable (1.0.0) release of this library. Once they are stabilized in Kotlin, this library should be updated.

[TheMrMilchmann]

No change in Kotlin 1.7 and I doubt there will be any movement until https://openjdk.org/jeps/401 is ready for preview.

[TheMrMilchmann]

Still no change in Kotlin 1.8

[TheMrMilchmann]

Still no change in Kotlin 1.9 (which is in the process of being released right now)

[TheMrMilchmann]

After further consideration, I decided to drop this as a requirement for 1.0.0. The API of this library is effectively stable and UByteArray is only used internally and in extremely niche chat links that are disabled anyway. Hence, the types are already marked as experimental and require explicit opt-in anyway.