Implement RFC 66: Simulation time. #3553

Job	Run time
document	48s
smoke (amaranth-lang/amaranth-boards)	48s
check-links	49s
smoke (amaranth-lang/amaranth-stdio)	45s
test (3.8)	2m 15s
smoke (amaranth-lang/amaranth-soc)	40s
test (3.9)	2m 10s
test (3.10)	2m 5s
test (3.11)	2m 20s
test (3.12)	3m 32s
test (pypy-3.8)	5m 17s
test (pypy-3.9)	5m 1s
test (pypy-3.10)	5m 22s
test (3.13-dev)	2m 51s
publish-docs	5s
publish-docs-dev	0s
required	1s
publish-package	43s
publish-schemas	5s
publish-release	0s
	35m 37s

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