rpc: add support for `wiring.Component`. [0.5 backport] #3589

Job	Run time
check-links	2m 12s
document	24s
test (3.8)	43s
smoke (amaranth-lang/amaranth-boards)	38s
test (3.9)	45s
smoke (amaranth-lang/amaranth-stdio)	53s
test (3.10)	37s
smoke (amaranth-lang/amaranth-soc)	1m 8s
test (3.11)	41s
test (3.12)	32s
test (pypy-3.8)	48s
test (pypy-3.9)	46s
test (pypy-3.10)	43s
test (3.13-dev)	40s
publish-docs	0s
publish-docs-dev	0s
required	1s
publish-schemas	0s
publish-package	0s
publish-release	0s
	11m 31s

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