The extensions 'contains' and 'reversed' from kotlin.ranges can be more
specific for IntRange, LongRange, etc than the same functions from
kotlin.collections, yet they lose in overload resolution to the latter
ones when invoked from kotlin.collections package
because of same package package extensions are preferred (KT-30633).
Provide UArraysKt class in kotlin.collections for binary compatibility
instead of removed multipart facade class. It contains only non-inline
functions of the latter.