main/util-linux: split dmesg into a subpackage

This allows installing dmesg from util-linux without pulling all the rest of the utilities from util-linux-misc.

assigned to @ncopa

what is the use case for this?

added 111 commits

• b63e02b4...03f22388 - 110 commits from branch alpine:master
• 0686fad4 - main/util-linux: split dmesg into a subpackage

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resolved all threads

merged