Faucet - users can't get faucet if several requests are sent in nearly the same time

### Describe the problem you discovered

Click on faucet with an address quickly 3 times. Only one or two transactions pass

### Describe the solution you'd like

An idea can be to provide a batching mechanism to get mutiple request and process them in the same time.
With the interval trigger of smart contracts, we can send to a smart contract a request that will be stored in inputs. At the trigger time, the smart contracts will get all of its inputs and process them to create a single transaction that send the faucet to mutiple addresses

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Epic: #592