[Bug] API does not return AA type in signature field of a transaction.

[lightmark]

🐛 Bug

when you query a txn with AA it shows something similar to

"signature": {
"function_info": "2224bfd56ed53e05b4a32820fe61b88c06c9b25d767a4759a1d758a1ef92759c::authenticator::authenticate",
"auth_data": "0x0020abe1876ff31ed9ba8a379a636d0980944cf7beee2f5591bd90d88dac165b3c990b68656c6c6f20776f726c64",
"type": "single_sender"
},

Actually AA is a sub type of single sender and function_info and auth_data is pertaining to AA.
The response is confusing.

To reproduce

https://api.testnet.aptoslabs.com/v1/transactions/by_version/6616059810

[lightmark]

but gprc return this:

      "signature": {
        "type": "TYPE_SINGLE_SENDER",
        "singleSender": {
          "sender": {
            "type": "TYPE_ABSTRACTION",
            "abstraction": {
              "functionInfo": "2224bfd56ed53e05b4a32820fe61b88c06c9b25d767a4759a1d758a1ef92759c::authenticator::authenticate",
              "signature": "ACCr4Ydv8x7Zuoo3mmNtCYCUTPe+7i9Vkb2Q2I2sFls8mQtoZWxsbyB3b3JsZA=="
            }
          }
        }
      }