WIP: unit-tests(clar): add CMake support #1756

Job	Run time
config	10s
fuzz smoke test	35s
win+VS build	0s
sparse	5m 23s
linux32 (daald/ubuntu32:xenial)	7m 58s
linux-musl (alpine)	7m 17s
pedantic (fedora)	1m 40s
static-analysis	3m 40s
win build	6m 52s
documentation	3m 28s
linux-gcc (ubuntu-20.04)	9m 49s
linux-asan-ubsan (ubuntu-latest)	19m 38s
win+VS test	0s
linux-gcc-default (ubuntu-latest)	10m 11s
linux-leaks (ubuntu-latest)	16m 11s
linux-reftable (ubuntu-latest)	10m 26s
linux-reftable-leaks (ubuntu-latest)	17m 13s
linux-sha256 (ubuntu-latest)	10m 27s
linux-TEST-vars (ubuntu-20.04)	10m 5s
osx-clang (macos-13)	20m 4s
osx-gcc (macos-13)	19m 52s
osx-reftable (macos-13)	19m 46s
win test	0s
	3h 20m 45s

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