feat: loopout automation

[ntheile]

This PR adds the ability to do loop outs.

New Features:

• loopd grpc service
• fully testable regtest environment for swaps (loopserver, loopd)
• trigger.ts server to listen for swap events
  • on success records swap fees to the ledger (service fee, miner fee, routing fee)
• cron.ts server to run swap outs on an interval

Quickstart - To test swap out locally in your regtest env

# 1. Start the loop server
make start-loopd
# 2. Monitor loop outs
loopd1_id=$(docker ps -q -f name="loopd1-1")
docker exec -it $loopd1_id loop -n regtest monitor
# 3. Loop out integration test (open a new terminal)
TEST="swap-out" make integration
# 4. Mine a block (or a few) to finish the loop out
make mine-block
make mine-block
make mine-block
# 5. Successful result should look like this: LOOP_OUT INITIATED => LOOP_OUT PREIMAGE_REVEALED => LOOP_OUT SUCCESS

Extra documentation in swap.md

[nicolasburtey]

@ntheile a key part that you'll need to add is the routing/loop server fees. this is similar to what we're doing for the miner fees in the rebalance function

because the money on fees is spent (get out of the instance), and we use double entry book-keeping, we want to make sure the liabilities (money owe to users) match the assets/utxo, and loop out means there is less assets overall and this should be accounted for

[nicolasburtey]

@ntheile rebase needed

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