properly evmMarshal evm_log_params

[Andrew7234]

Certain datatypes of the abi-parsed evm_log_params weren't being stored in a json-friendly format. For example, uint256 should be stored as a string, not a number, to avoid issues with float conversion and display properties when retrieved via the json api.

Turns out the function to do this already exists in the abiparse package; this PR utilizes it to properly marshal abi arguments in the abi backfill analyzer.

Testing:

    {
      "body": {
        "address": "mYYzvfbuMqnMpsmiR/QoWW6OZdg=",
        "data": "",
        "topics": [
          "3fJSrRviyJtpwrBo/DeNqpUrp/FjxKEWKPVaTfUjs+8=",
          "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=",
          "AAAAAAAAAAAAAAAAFEG7vhVk0LPkiffFvMTwxexMTNg=",
          "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIQ="
        ]
      },
      "eth_tx_hash": "701bb26dd38138fab220b60b6f93586a6e354334dd88799229084af3e46d71d9",
      "evm_log_name": "Transfer",
      "evm_log_params": [
        {
          "evm_type": "address",
          "name": "from",
          "value": "0x0000000000000000000000000000000000000000"
        },
        {
          "evm_type": "address",
          "name": "to",
          "value": "0x1441bbbe1564d0b3e489f7c5bcc4f0c5ec4c4cd8"
        },
        {
          "evm_type": "uint256",
          "name": "tokenId",
          "value": "132"
        }
      ],
      "round": 410435,
      "timestamp": "2023-05-04T16:10:26-04:00",
      "tx_hash": "49e4c707ee9d4586d98d45c67093473420652a468581ca31851a881d91620d31",
      "tx_index": 0,
      "type": "evm.log"
    }
  ],
  "is_total_count_clipped": false,
  "total_count": 166

^Note the third tokenId parameter is properly returned as a string now

[pro-wh]

alright kool, if it's suitable

[mitjat]

Thanks! Looks good, though I suggest waiting for #633 to go in so we can see the effects even better.