Fix ProtoBuf packing for kotlin unsigned types#3079

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KosmX wants to merge 3 commits intoKotlin:devfrom

Commits on Sep 12, 2025

New tests for packed unsigned encoding (failing for now)
KosmX
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Add UByteArray as "bytes" serializer, just like ByteArray
KosmX
committed
Make sure that primitives and inline value classes that are primitives can be packed.
KosmX
committed