Handle Payment Metadata in the Invoice/Send/Receive Pipelines#1221

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TheBlueMatt wants to merge 11 commits intolightningdevkit:mainfrom

TheBlueMatt:2021-12-payment-metadata

Commits on Jan 26, 2022

Define the `PaymentMetadata` feature to be used in invoices
TheBlueMatt
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Unset the optional bit for a feature when setting the required bit
TheBlueMatt
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Support reading the new `payment_metadata` field in invoices
TheBlueMatt
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Support setting the new payment metadata field in invoices
TheBlueMatt
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Pass FinalOnionHopData to payment verify by reference, not clone
TheBlueMatt
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Store total payment amount in ClaimableHTLC explicitly
TheBlueMatt
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Avoid storing a full FinalOnionHopData in OnionPayload::Invoice
TheBlueMatt
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Deserialize payment metadata fields in the onion final hop data
TheBlueMatt
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Provide users the payment metadata via `Event::PaymentReceived`
TheBlueMatt
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Pipe payment metadata through the HTLC send pipeline
TheBlueMatt
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Expose payment metadata in the sending path via `send_payment`.
TheBlueMatt
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