Implement Bolt12 payer proofs - #3297
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As specified in lightning/bolts#1295
The `proof_signature` now signs a merkle tree that contains all TLVs of the payer proof, similar to how `offer`, `invoice_request` and `invoice` are signed.
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As specified in lightning/bolts#1295. Note that this doesn't include the latest changes to build a merkle tree with all payer proof TLVs (since test vectors aren't updated yet and discussions are still ongoing on how to handle leaf nonces for payer proof TLVs).