refactor(tests): split up test suites, update docs #896

Job	Run time
build-splicer (windows-latest)	19s
lint	57s
build-splicer (ubuntu-latest)	10s
build (weval)	10s
build (release)	8s
build (debug)	9s
test-example	36s
test (23.10.0, windows-latest, release)	7m 31s
test (23.10.0, windows-latest, debug)	8m 18s
test (23.10.0, ubuntu-latest, release)	5m 59s
test (23.10.0, ubuntu-latest, debug)	6m 45s
test (23.10.0, ubuntu-latest, weval)	8m 45s
test (23.10.0, macos-latest, release)	3m 57s
test (23.10.0, macos-latest, debug)	5m 57s
test (23.10.0, macos-latest, weval)	7m 52s
test (23.10.0, windows-latest, weval)	11m 26s
	1h 8m 59s

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