[RFC] Add BOLT 12 payer proof primitives #22981

Job	Run time
build-features / build (self-hosted, 1.75.0)	5m 3s
rustfmt	14s
build-bindings / build (self-hosted, 1.75.0)	5m 21s
build-sync / build (self-hosted, 1.75.0)	6m 8s
fuzz_sanity	5m 14s
fuzz	5m 19s
check_release	2m 50s
ext-test	5m 18s
build-cfg-flags / build (self-hosted, 1.75.0)	5m 19s
check_docs	5m 21s
linting	2m 36s
tor-connect	5m 18s
build-workspace / build (self-hosted, 1.75.0)	6m 7s
build-nostd / build (self-hosted, 1.75.0)	4m 51s
benchmark	5m 18s
coverage	1s
notify-failure	1s
	1h 10m 19s

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