Get a cast by its FID and Hash.

curl --request GET \
  --url https://hub.pinata.cloud/v1/castById

{
  "hash": "0xd2b1ddc6c88e865a33cb1a565e0058d757042974",
  "hashScheme": "HASH_SCHEME_BLAKE3",
  "signature": "aSDinaTvuI8gbWludGxpZnk=",
  "signatureScheme": "SIGNATURE_SCHEME_ED25519",
  "signer": "<string>",
  "data": {
    "type": "MESSAGE_TYPE_CAST_ADD",
    "fid": 2,
    "timestamp": 48994466,
    "network": "FARCASTER_NETWORK_MAINNET",
    "castAddBody": {
      "embedsDeprecated": [
        "<string>"
      ],
      "mentions": [
        2
      ],
      "parentCastId": {
        "fid": 123,
        "hash": "<string>"
      },
      "parentUrl": "chain://eip155:1/erc721:0x39d89b649ffa044383333d297e325d42d31329b2",
      "text": "<string>",
      "mentionsPositions": [
        123
      ],
      "embeds": [
        {
          "url": "<string>",
          "castId": {
            "fid": 123,
            "hash": "<string>"
          }
        }
      ]
    }
  }
}