feat: alby lite app

[im-adithya]

⚠️ Proof of Concept - Not to be merged, yet.

[rolznz]

Some thoughts + ones we talked about yesterday:

• After our conversation about NIP-05 not being a good way to contact the user, I am wondering if this should be optional, as it's only really needed if you specifically want a albylite NIP-05 address.
• This now "competes" with the Friends & Family app (which do we choose?). Would it make sense to move it there as an optional step after the account is created?
• We have the issue that sub-wallets have spending permission. But we have not found a graceful way to handle this. Some of us think Alby Lite should not have spending access to wallets. It should have receive-only access.
• From Rene: "Wasn't the main problem with Alby Lite that we didn't have a good answer for how the customer journey would look like for these people and it would make the existing product landscape even more complicated?" - we plan to have a call about this next week.
• I like the idea about paying up-front especially if we find a way to do receive-only connections for alby lite.
• From Moritz: There is another app we could make (based on Bumi's app) which is lightning addresses for receive-only isolated connections, where the lightning address itself contains the connection secret