Structure update

[buffrr]

This adds getblockmeta and gettxmeta (helper) closes #14 and closes #18.

New structure looks like the one we discussed here

New format

Rejects are now script errors

For example, calling OP_OPEN on a name that already exists will just be a script error (this used to be in vmetaout):

{
  "txid": "b38982ddd21abce52eb17042afe324944a91a98fda2af96370b8aa8459c4f848",
  "spends": [
    {
      "n": 1,
      "script_error": {
        "type": "reject",
        "name": "@artfuldev",
        "reason": "already_exists"
      }
    }
  ],
  "creates": [],
  "updates": []
}

Updates have a type: bid, rollout or revoke

All updates have an output object which links to the external output being affected by this transaction

Type bid

Updates to bid outputs look like this

"updates": [
{
  "type": "bid",
  "output": {
    "txid": "a9226ee6316b88737776fab48824f9694c184bcc75577c7844bec2363613a820",
    "n": 1,
    "name": "@bitcoin",
    "covenant": {
      "type": "bid",
      "burn_increment": 223,
      "signature": "aa6e6b5ecf6085cdbfffd0c7907418d4f5a0da532eaa8309d0e0831afb02f47d19edbb8ee30711e7a54f062ce9238bf9f56500cdc31b9561900ba5f2b29d2a28",
      "total_burned": 3000,
      "claim_height": 40489
    },
    "value": 662,
    "script_pubkey": "5120396909d29e4d68464d51b7009be7e2ca26eb5d8122e1f3b32a668b11f031144a"
  }
}]

Typerollout

"updates": [
{
  "type": "rollout",
  "priority": 1000,
  "output": {
    "txid": "4ac2ba3c5955273eef077693446a5065bb3e6c4fe5e6d18f905a0310757ae04f",
    "n": 1,
    "name": "@911",
    "covenant": {
      "type": "bid",
      "burn_increment": 1000,
      "signature": "3f94a98b1bfcf03a50af9dc92ab94c9380826b036c7be03ba4be33d043a50fa8653341c8fd27ca13fb71f7832b16ed13ea63a527c5426877d915141498dffe05",
      "total_burned": 1000,
      "claim_height": 50689
    },
    "value": 662,
    "script_pubkey": "5120cc83e77e4718e58761d4f37082d5434f13fe9d29f3dd37c0c1ad2a26c91e61ad"
  }
}]

Type revoke

Updates revoking an output look like this:

"updates": [
{
  "type": "revoke",
  "revoke_reason": "bid_psbt",
  "bid_psbt_reason": "low_bid_amount",
  "output": {
    "txid": "45e62540138ff1877dd04a53a62ff33eb69ec9ffaab216d92a5ce47fd4441f77",
    "n": 1,
    "name": "@k",
    "covenant": {
      "type": "bid",
      "burn_increment": 1000,
      "signature": "38808af35e6413bc3258b20ffb146acb570bd849706562b742293c0769bf2856d4aac4c441964deee71458834c1a1b937e4d58b3cfbcc7d01e1a1a47e3d519d6",
      "total_burned": 1000,
      "claim_height": 50977
    },
    "value": 662,
    "script_pubkey": "512099cdda46140ef48b5d144ca8b3c62303bb13aba73a7fb27e79bfac3f1235e7d2"
  }
}
]

This one provides a bit more detailed error for bid psbt due to the nested rust enums and how they appear as json.

Will merge this after some additional testing. Any thoughts @randomlogin ? do you want to give this PR a try in the meantime?