RFC for PoC of bolt12 contacts formally known as a BLIP 42 #23428

Job	Run time
check_docs	5m 49s
tor-connect	5m 31s
build-features / build (self-hosted, 1.75.0)	2m 13s
fuzz_sanity	10m 11s
linting	2m 17s
benchmark	1m 38s
build-bindings / build (self-hosted, 1.75.0)	3m 46s
build-workspace / build (self-hosted, 1.75.0)	5m 9s
build-cfg-flags / build (self-hosted, 1.75.0)	2m 5s
ext-test	6m 46s
fuzz	53m 49s
check_release	2m 58s
build-sync / build (self-hosted, 1.75.0)	18m 15s
build-nostd / build (self-hosted, 1.75.0)	6m 6s
rustfmt	16s
coverage	0s
notify-failure	0s
	2h 6m 49s

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