LDK Node integration

[danielnordh]

Replace BDK / BDKManager with LDK Node / LDKNodeManager

• Add package, create node, start, sync
• On startup we need to know if user is new or have node (by checking if mnemonic is backed up), temporally saving the node seed for now
• Create node from mnemonic and back up recovery phrase etc - blocked by Allow to configure seed via a BIP 39 mnemonic lightningdevkit/ldk-node#66
• Display total balance (onchain and lightning) - lightning blocked by Expose list peers and channels lightningdevkit/ldk-node#56
• Open a channel so that user can send/receive on lightning - from onchain funds
• Open a just-in-time channel using LSPS.1 when available Just in time channel with Voltage #12
• Handle receive lightning
• Handle send lightning
• Handle receive onchain
• Handle send onchain - blocked by Allow for withdrawing on-chain funds lightningdevkit/ldk-node#61
• Show all transactions - onchain blocked by Expose on-chain transactions lightningdevkit/ldk-node#67

[danielnordh]

Goal

A wants to send x sats to B
A opens a channel to B, pays for it
B creates invoice
A pays invoice to B
A creates invoice
B pays invoice to A

[danielnordh]

Open questions (no LSP)

• What happens when mobile nodes are offline?
• Channel closures?