[api] Add signature_type to AccountSignature

[gregnazario]

Description

For a while, it's hard to tell what the underlying type of each signature is. Now, it adds a non-conflicting type to determine it.

Note that, this change currently breaks the existing OpenAPI spec documentation, but will still work with the old information.

How Has This Been Tested?

I tested this manually against many of the different types of transactions in the API, to see how they would show up in the explorer. Here are some examples:

Single key, with ed25519:

{
  "public_key":{
    "value":"0x4d7139da37bda01a68efd463fcafb67effb7c5ea0b5375d18a81439ee642d0b3"
    "type":"ed25519"
  }
  "signature":{
    "value":"0x5371902e6be7a747f6ef4e5c79e69a9c6ff9d4339df2823d115d2b28223f0887a562d0ee469538..."
    "type":"ed25519"
  }
  "type":"single_sender"
  "signature_type":"single_key_signature"
}

Single key, with secp256k1:

{
  "public_key": {
    "value": "0x044a10acd849690bccfa8a74e66de26a2bada930ba65ba795877e7b5c19f7cd91475d539dfd799...",
    "type": "secp256k1_ecdsa"
  },
  "signature": {
    "value": "0xe80937ecf14fb43097370d466121fec705a0399ada293eac544159a7bfb6214c368a6012722007...",
    "type": "secp256k1_ecdsa"
  },
  "signature_type": "single_key_signature",
  "type": "single_sender"
}

Abstraction:

{
  "function_info": "a7a28b48b320bcbce6bbf651b8df497dcdc28e132edb0eb043b7fa822d0d29f7::public_key_aut...",
  "auth_data": "0x0020d4298fcbed8db14395a3c43f85660ead880ed833b0680cea8441ab8ed9efc8d662203b04c6...",
  "signature_type": "abstraction_signature",
  "type": "single_sender"
}

Ed25519 (original):

{
  "public_key": "0x2f4847fee7c1612edd78cfbccdce7928e4925a61c1f752d8c893765aa3cc585d",
  "signature": "0x49fb5a47d34edf4854c028374c057f3d95d6d2aa7fba3d4eb7c89cda01b8ea28e54953b4e3976c...",
  "type": "ed25519_signature"
}

MultiKey:

{
  "public_keys": [
    {
      "value": "0x157f8119aa413789ff05ce0237c01b53c5d79e033700f27a5a98d6f25b061e15",
      "type": "ed25519"
    },
    {
      "value": "0xb6d55b87fc4b274f50ef50bf2dd953f00c56c2565d240155852c25f1c301c90e",
      "type": "ed25519"
    },
    {
      "value": "0x0477686a315555bf3fd2dfa1acc2e4338ab84e6f8f4bb93521a6d21209a6fb20f3e131d0e374f2...",
      "type": "secp256k1_ecdsa"
    }
  ],
  "signatures": [
    {
      "index": 0,
      "signature": {
        "value": "0x065e6588c8e3144d1411a0910f7a1a7876e5acb9a6e08d545e4d47b7af72eb01cfea20b04cdbcd...",
        "type": "ed25519"
      }
    },
    {
      "index": 1,
      "signature": {
        "value": "0x5c8050c6858b076093068c12e32c778bf8a1930310dd73f3efb525a57ab22e8a5b09c17102dc81...",
        "type": "ed25519"
      }
    },
    {
      "index": 2,
      "signature": {
        "value": "0xbf092cdc343d605c7c30c8216febb54a400fc87b43dcd5b2bbe53878409191e85e02e9b0b42912...",
        "type": "secp256k1_ecdsa"
      }
    }
  ],
  "signatures_required": 3,
  "type": "single_sender",
  "signature_type": "multi_key_signature"
}

Multiagent with single signers in it

{
  "sender": {
    "public_keys": [
      {
        "value": "0x3c4d4d1a7e39ce4be8d9eb21ca94588a8abbe7aab8085a5634f8ac8cc4772e62",
        "type": "ed25519"
      },
      {
        "value": "0x6ffe6c83b029dd0955b4c4204d7d6c2e33437efae90ea96137c46e7bdcb6b3af",
        "type": "ed25519"
      },
      {
        "value": "0x0474c524c42d9cb02b60ebfdf94709ff8cbbc1ea5793a66e402957e8f44341ea613c5e3799c014...",
        "type": "secp256k1_ecdsa"
      }
    ],
    "signatures": [
      {
        "index": 0,
        "signature": {
          "value": "0x4765e75e17ea7e27271f77a618144fcaf404160d540dd747f22c342261f2390a124e8cabea79dc...",
          "type": "ed25519"
        }
      },
      {
        "index": 1,
        "signature": {
          "value": "0xef594c12d3cd3973db327ef8a96df2281a449467061e59bca6973da8778ede288164b14701197a...",
          "type": "ed25519"
        }
      },
      {
        "index": 2,
        "signature": {
          "value": "0xb88f5d8c0dada4256b4bce904db28a764acae85b415eca6b4cac925102cb5d0c390cb068d9e1e2...",
          "type": "secp256k1_ecdsa"
        }
      }
    ],
    "signatures_required": 3,
    "type": "multi_key_signature",
    "signature_type": "multi_key_signature"
  },
  "secondary_signer_addresses": [
    "0x67ec75166b320d045a1bbe4570065212ba43ff23b247e54bdaec0f208d8af41c"
  ],
  "secondary_signers": [
    {
      "public_key": {
        "value": "0x04b267eac22b50ee5e9cd2dc12a9cc658564f51ac392366778f0e1a882db9a365a9e8e2d1d48e1...",
        "type": "secp256k1_ecdsa"
      },
      "signature": {
        "value": "0x4246458f6ec05d22bdd42af1ab62c0904b19da964e98dcd99111dde7d8a478c52d751b097e08ee...",
        "type": "secp256k1_ecdsa"
      },
      "type": "single_key_signature",
      "signature_type": "single_key_signature"
    }
  ],
  "type": "multi_agent_signature"
}

Fee payer

{
  "sender": {
    "public_key": "0xf3e5d0ab97b300e362c66c7b7e055885bf8ecc7bbef227b890fdd13dd04e7101",
    "signature": "0x1002c890edfd14f558d99a0ca1ecf53f3dbfcd9c08e13660bb3d8948439ebc47af5c8062962a62...",
    "type": "ed25519_signature",
    "signature_type": "ed25519_signature"
  },
  "secondary_signer_addresses": [],
  "secondary_signers": [],
  "fee_payer_address": "0x1783973c1d04ee8e4cb099f6c43e4896bf8ff868ee195509063d42223ebd7a08",
  "fee_payer_signer": {
    "public_key": "0xc897e48af8606340e8112ee095bf2884bb0bcf3ccdc52041c1792fa2102a4ee7",
    "signature": "0xa46157d8160b578449329c39f34c5c0a9c5fdf4bf67d51d876e0cb9f27e6d6128a036758f51215...",
    "type": "ed25519_signature",
    "signature_type": "ed25519_signature"
  },
  "type": "fee_payer_signature"
}

Key Areas to Review

Type of Change

• New feature
• Bug fix
• Breaking change
• Performance improvement
• Refactoring
• Dependency update
• Documentation update
• Tests

Which Components or Systems Does This Change Impact?

• Validator Node
• Full Node (API, Indexer, etc.)
• Move/Aptos Virtual Machine
• Aptos Framework
• Aptos CLI/SDK
• Developer Infrastructure
• Move Compiler
• Other (specify)

Checklist

• I have read and followed the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I identified and added all stakeholders and component owners affected by this change as reviewers
• I tested both happy and unhappy path of the functionality
• I have made corresponding changes to the documentation

[trunk-io]

⏱️ 5m total CI duration on this PR

Job	Cumulative Duration	Recent Runs
rust-cargo-deny	2m	🟩
check-dynamic-deps	2m	🟩
general-lints	27s	🟩
semgrep/ci	22s	🟩
file_change_determinator	11s	🟩
permission-check	2s	🟩
permission-check	2s	🟩

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