support poolid's in hex instead

[cleverca22]

https://github.com/input-output-hk/cardano-world/blob/master/src/cardano-faucet/src/Cardano/Faucet/Web.hs#L51-L52

currently, this code only supports parsing a poolid in bech32 form, pool18ttg8kwe7w858sdk8rcw08cujytn6vjvpsc9t9c64n6h27wza2u
it should also support it in hex form: 3ad683d9d9f38f43c1b638f0e79f1c91173d324c0c3055971aacf575