Migrate to kotlinx.io and kotlin.uuid?

[martinbonnin]

Description

There are now first party libs for uuid and io:

kotlin.uuid: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.uuid/-uuid/ kotlinx.io: https://github.com/Kotlin/kotlinx-io

They are still experimental so using them is not an option right now but this is a tracking issue to remember it.