Add PaymentMetadataStore for Bolt11 and Bolt12 inbound payments#537

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moisesPompilio wants to merge 6 commits intolightningdevkit:mainfrom

moisesPompilio:issue_425

Commits on May 6, 2025

Introduce PaymentMetadata, PaymentMetadataStore, and PaymentDataWithFallback
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Add persisted payment metadata reading in store
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Add `legacy_payment_store` Cargo feature for compatibility testing
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Persist payment metadata for pending inbound payments instead of using paymentStore
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Update test to support new PaymentMetadata rule while preserving legacy behavior
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Ci: Add test legacy_payment_store
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