Test

Split out module `core` into separate crate #2498

Job	Run time
check-cargo-check	4m 12s
check-formatting	15s
Swift format	0s
check-clippy	4m 27s
check-typos	22s
check-version	8s
code-coverage	22m 41s
test-kotlin	13m 33s
test-rust	15m 39s
test-swift	12m 1s
phylum-analyze / Analyze dependencies with Phylum	14s
	1h 13m 32s

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