feat request: add faucet

[aodhgan]

the other rollups as a service have a faucet or require a user to connect their wallet and then fund the address. (how am I supposed to use the rollup after its been spun up?)

[emilianobonassi]

thanks for the issue @aodhgan, definitely something essential to add! feel free to make a PR if you have some preferred one

I was exploring this https://github.com/komputing/FaucETH