Post a cast

curl --request POST \
  --url https://api.neynar.com/v2/farcaster/cast/ \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '{
  "signer_uuid": "19d0c5fd-9b33-4a48-a0e2-bc7b0555baec",
  "text": "<string>",
  "embeds": [
    {
      "cast_id": {
        "hash": "<string>",
        "fid": 3
      }
    }
  ],
  "parent": "<string>",
  "channel_id": "neynar",
  "idem": "<string>",
  "parent_author_fid": 3
}'

{
  "success": true,
  "cast": {
    "hash": "0x71d5225f77e0164388b1d4c120825f3a2c1f131c",
    "author": {
      "fid": 3
    },
    "text": "<string>"
  }
}