feat: nwc create_connection command (WIP)

[rolznz]

This is a bit of an exploration on how new app connections could be created via nwc (e.g. for NWA). e.g. in Alby Go.

Things I noticed:

• initial implementation is quite minor, most of the code is already written.
• use methods instead of scopes since scopes do not exist in the NIP-47 spec.
• UI change required to have the new superuser scope
• budgets and other restrictions do not make sense if this scope exists, since the superuser scope can create new connections without restrictions
• Alby Go would need a custom detail page to enable the superuser scope
• Does there need to be a way in the hub to explicitly confirm a superuser scope to create an app (e.g. re-entering unlock password?)
• add missing tests
• implement in JS SDK
• implement "NWA" in bitcoin connect
• implement "NWA" in Alby Go