Add support for the bitcoin lighting network to UniSat wallet

[MoritzKa]

UniSat could support the bitcoin lightning network by using the open nwc.dev protocol.

• users can quickly connect their lightning wallet to UniSat and pay with bitcoin through the UniSat Extension
• it is self-custodial for UniSat, so every user can use UniSat without KYC
• support can be outsourced to the actual connected wallet provider

The Alby Extension (getalby.com) already let's users connect their own wallets via NWC.

There is now a NWC HTTP API to communicate payment requests with other wallets over relays here.
The API translates the async nature of the lightning network and the NWC protocol into a default synchronous HTTP request. Or it notifies your application through webhooks. So it makes it a lot easier to implement the app-side of NWC and let Umbrel, Start9, Alby and Mutiny users connect to your app.
The only thing that needs to be done is to create the JSON payload and encrypt it correctly. 🙂

[GGG888GGG]

@huanniangstudio @abangZ