Add Support for Lightning Loop

[reemuru]

Integrate Lightning Loop in Joule UI

Lightning Loop is a non-custodial service offered by Lightning Labs to bridge on-chain and off-chain Bitcoin using submarine swaps. This repository is home to the Loop client and depends on the Lightning Network daemon lnd. All of lnd’s supported chain backends are fully supported when using the Loop client: Neutrino, Bitcoin Core, and btcd.
Loop Github

User Stories

• User can view Loop Out Terms
• User can view Loop Out Quote
• User can initiate a Loop out
  Pending REST API docs
• User can view Loop In Terms
• User can view Loop In Quote
• User can initiate a Loop In

Swagger Docs .yml for REST API

swagger json

[reemuru]

Started adding support for Loop Out.
Pretty barebones for now...
Should have a PR soon.

[reemuru]

Actually, gonna change the loop page for better UI later this week.
Will have a form that supports both in/out functionality with a selector switch somewhere up top.
There will be two buttons that change depending on the selector switch. Terms will be displayed as a tooltip when hovering the Quote Button. Quote button onClick will display a modal with respective quote based on form entry. Finally, there will be one Loop button which changes operation based on the "in/out" selector switch.