bolt12: allow to inject payer_metadata #11330

Job	Run time
Check Nix Flake	15m 37s
Pre-build checks	11m 3s
Run fuzz regression tests	6m 22s
Compile CLN compile-gcc	6m 23s
Compile CLN compile-gcc-O3	6m 22s
Compile CLN compile-clang	6m 22s
Compile CLN compile-clang-sanitizers	6m 24s
Valgrind Test CLN ${{ matrix.name }}	1s
Test CLN ${{ matrix.name }}	1s
Run unit tests	1s
Sanitizers Test CLN	1s
Test minimum supported BTC v${{ matrix.MIN_BTC_VERSION }} with ${{ matrix.NAME }}	1s
CI completion	1s
	58m 39s

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