Faucet cooldown does not work in HA setups

[ggarri]

Context

Cooldown faucet controller does not work on HighAvailability setups due to design limitations.

At current implementation faucet authorizations are stored in each of the instance memories, so that same account could be funded twice by the same faucet just by requesting funds to different instances of chain-registry

Implemetation

Opt1: Postgres

A possible solution could be to store faucet authorization at database level which is shared across every chain-registry instance.

Opt2: tx-scheduler

Another possible alternative would be to query tx-scheduler to verify which was the latest funding txs.