refactor(tests): split up test suites, update docs #919

Job	Run time
lint	46s
build-splicer (windows-latest)	13s
build-splicer (ubuntu-latest)	5s
build (release)	6s
build (debug)	9s
build (weval)	9s
test-example	35s
test (23.10.0, ubuntu-latest, release)	6m 11s
test (23.10.0, ubuntu-latest, weval)	9m 0s
test (23.10.0, ubuntu-latest, debug)	6m 50s
test (23.10.0, windows-latest, weval)	12m 22s
test (23.10.0, macos-latest, weval)	12m 15s
test (23.10.0, macos-latest, debug)	4m 53s
test (23.10.0, windows-latest, release)	7m 7s
test (23.10.0, macos-latest, release)	7m 18s
test (23.10.0, windows-latest, debug)	8m 38s
	1h 16m 37s

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