rpc: add support for `wiring.Component`. [0.5 backport] #3590

Job	Run time
check-links	19s
smoke (amaranth-lang/amaranth-boards)	36s
test (3.8)	40s
document	22s
smoke (amaranth-lang/amaranth-stdio)	58s
test (3.9)	42s
smoke (amaranth-lang/amaranth-soc)	53s
test (3.10)	41s
test (3.11)	39s
test (3.12)	34s
test (pypy-3.8)	49s
test (pypy-3.9)	49s
test (pypy-3.10)	47s
test (3.13-dev)	45s
publish-docs	0s
publish-docs-dev	0s
required	1s
publish-schemas	0s
publish-package	0s
publish-release	0s
	9m 35s

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