Add support for unsigned numbers arrays

[osipxd]

What is your use-case and why do you need this feature?

Use-cases for U[X]Array, are similar as for [X]Array.

Describe the solution you'd like

Add serializers for UByteArray, UShortArray, UIntArray and ULongArray.

val bytes = Json.decodeFromString<UByteArray>("[0, 127, 255]")
prtintln(bytes.contentToString()) // [0, 127, 255]

[osipxd]

I can try to implement this feature myself if it is needed

[shanshin]

@osipxd, thanks for the offer, but this improvement requires changing not only the serialization runtime, but also the plugin. The feature will be available after several Kotlin releases.