lib.data.{Field, Layout, Const}: add hash #3763

Job	Run time
document	57s
smoke (amaranth-lang/amaranth-boards)	48s
check-links	55s
smoke (amaranth-lang/amaranth-soc)	57s
test (pypy-3.9)	4m 47s
test (3.10)	2m 13s
test (3.12)	3m 24s
smoke (amaranth-lang/amaranth-stdio)	55s
test (3.9)	2m 26s
test (pypy-3.11)	3m 50s
test (3.13)	3m 51s
test (3.11)	3m 12s
test (pypy-3.10)	5m 8s
test (3.14-dev)	2m 11s
publish-docs	9s
publish-docs-dev	-1s
required	3s
publish-package	14s
publish-schemas	7s
publish-release	0s
	36m 6s

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