Make `rascal.toml` an alternative to `rascal.mf` #1113

Job	Run time
test-linux	3m 37s
builds	14m 1s
tests (windows-latest)	10m 40s
tests (macos-latest)	8m 31s
tests (buildjet-4vcpu-ubuntu-2204-arm)	3m 34s
	40m 23s

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