Incentive system based on Lightning

i feel like this solution should just be merged to main, so petals grows 👍

https://github.com/kouloumos/petals-lightning-chat

with a simple incentive system, there could be a lot more capacity.

would you be open to adding a lnurl support to petals at a lower layer?

i'm thinking some simple optional configuration for people who donate and use gpus that turn on lightning micropayments, should be fairly trivial to set maximums, etc.