rpc: add support for `wiring.Component`. [0.5 backport] #3591

Job	Run time
document	18s
check-links	22s
test (3.8)	39s
smoke (amaranth-lang/amaranth-boards)	31s
test (3.9)	45s
smoke (amaranth-lang/amaranth-stdio)	42s
test (3.10)	39s
smoke (amaranth-lang/amaranth-soc)	40s
test (3.11)	38s
test (3.12)	38s
test (pypy-3.8)	51s
test (pypy-3.9)	52s
test (pypy-3.10)	52s
test (3.13-dev)	50s
publish-docs	0s
publish-docs-dev	0s
required	1s
publish-schemas	0s
publish-package	0s
publish-release	0s
	9m 18s

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