cargo

Move core metrics registration into a new metriken-core crate (#96) #369

Job	Run time
clippy	21s
audit	11s
check-ubuntu-latest	24s
build-ubuntu-latest-release	40s
check-macos-latest	52s
build-ubuntu-latest-debug	37s
rustfmt	9s
check-windows-latest	2m 42s
build-macos-latest-release	58s
build-macos-latest-debug	58s
build-windows-latest-release	53s
build-windows-latest-debug	54s
clippy-upload	13s
verify all tests pass	0s
	9m 52s

Provide feedback