feat: fetch /addresses/{addr}/utxos from the ledger state

[michalrus]

Resolves #295

Remaining issues

It’s almost possible. It seems we can’t do the block field (block hash of the UTxO)…

There are a few questions/FIXMEs in code.

See the reference: https://docs.blockfrost.io/#tag/cardano--addresses/GET/addresses/{address}/utxos.

Example

❯ curl -fsSL "http://localhost:3000/addresses/addr_test1qzv6tjc04rce4w3cet8c5fpavvs5jy5l3qkl828x0a4a2y4ukrx7v6j5t60mcl9yfyhnn09p7nextnq4qw6004hlypwq9acu7l/utxos" | jq .

[
  {
    "address": "addr_test1qzv6tjc04rce4w3cet8c5fpavvs5jy5l3qkl828x0a4a2y4ukrx7v6j5t60mcl9yfyhnn09p7nextnq4qw6004hlypwq9acu7l",
    "tx_hash": "86110f1d3293127a63ab21ddbe9de676882fe03efa3aac118855de8a496f9ff9",
    "output_index": 1,
    "amount": [
      {
        "unit": "lovelace",
        "quantity": "9874818490"
      }
    ],
    "block": "impossible for now?",
    "data_hash": null,
    "inline_datum": null,
    "reference_script_hash": null
  }
]

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[ginnun]

LGTM

[mmahut]

We can discuss this tomorrow, but I think we will ahead with it. But we might "hide" it behind a new API path, something like /compact.