[RFC] Add BOLT 12 payer proof primitives #22918

Job	Run time
ext-test	7m 39s
fuzz	38m 3s
check_docs	7m 30s
fuzz_sanity	9m 3s
check_release	2m 57s
tor-connect	6m 21s
build-nostd / build (self-hosted, 1.75.0)	8m 56s
rustfmt	15s
linting	2m 10s
benchmark	1m 57s
build-workspace / build (self-hosted, 1.75.0)	5m 34s
build-features / build (self-hosted, 1.75.0)	1m 52s
build-cfg-flags / build (self-hosted, 1.75.0)	2m 24s
build-bindings / build (self-hosted, 1.75.0)	6m 7s
build-sync / build (self-hosted, 1.75.0)	10m 24s
coverage	0s
notify-failure	0s
	1h 51m 12s

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