feat: expand LND support

[im-adithya]

Fixes getAlby/hub#91

Needs the Channel Peers API to be fixed and UI to be changed before merging

Adds

• [x] GetNodeConnectionInfo
• [x] GetBalances
• [x] ListChannels
• [x] OpenChannel
• [x] CloseChannel
• [x] ListPeers
• [x] ConnectPeer
• [x] GetOnchainBalance
• [x] GetNewOnchainAddress

[rolznz]

@im-adithya how did you test this? for example, there's no change on the frontend to allow the liquidity page to show

[rolznz]

On the channels page the savings balance shows 0. Can you implement the GetBalances() function in lnd.go?

[rolznz]

Open Channel does not work using Polar because there are no channel suggestions. I wonder if we should move the custom option to the frontend CC @bumi

It also then does not need to be duplicated for mainnet and signet

[im-adithya]

Added GetBalances call 👍

[bumi]

oh yay, merged!