Implement RFC 66: Simulation time. #3555

Job	Run time
check-links	1m 47s
document	51s
smoke (amaranth-lang/amaranth-boards)	36s
test (3.8)	2m 29s
smoke (amaranth-lang/amaranth-stdio)	36s
test (3.9)	2m 29s
smoke (amaranth-lang/amaranth-soc)	41s
test (3.10)	2m 15s
test (3.11)	2m 54s
test (3.12)	3m 51s
test (pypy-3.8)	5m 29s
test (pypy-3.9)	5m 3s
test (pypy-3.10)	4m 50s
test (3.13-dev)	3m 13s
publish-docs	9s
publish-docs-dev	0s
required	1s
publish-schemas	5s
publish-package	36s
publish-release	0s
	37m 55s

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