Support sending `PaymentMetadata` in HTLCs#2127

Merged

TheBlueMatt merged 15 commits intolightningdevkit:mainfrom

TheBlueMatt:2023-03-payment-metadata

Apr 19, 2023

Commits on Apr 7, 2023

Define the `PaymentMetadata` feature to be used in invoices
TheBlueMatt
committed

Commits on Apr 19, 2023

Add features module-level documentation for missing features
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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Deserialize payment metadata fields in the onion final hop data
TheBlueMatt
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Add a `payment_metadata` field to `RecipientOnionFields`
TheBlueMatt
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Make `claimable_payments` map value a struct, rather than a tuple
TheBlueMatt
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Add a debug_assert the newly-documented (but existing) requirement
TheBlueMatt
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`continue` automatically after `fail_htlc` in receiving an HTLC
TheBlueMatt
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Pipe received `payment_metadata` through the HTLC receipt pipeline
TheBlueMatt
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Expose the `RecipientOnionFields` in `Event::PaymentClaimable`
TheBlueMatt
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Add some tests of payment metadata being sent and received
TheBlueMatt
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Update and clarify the reasons for HTLCDestination::FailedPayment
TheBlueMatt
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Fix variable name typo
TheBlueMatt
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