feat(modules): support subsystem listing #1501

Job	Run time
dockerfile-style / dockerfile-style	9s
crystal-style / crystal-style	1m 43s
test / crystal: latest, MT: ☐, canary: ☐	14m 48s
test / 🚧 crystal: unstable, MT: ☐, canary: ☐	14m 47s
test / TODOs → GitHub Issues	19s
	31m 46s

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