add support to identify payable methods in an arbitrary contract and add an extra field called "value" to add the amount of ICX to be transferred

[FidelVe]

payable methods are those that allow for sending ICX in the transaction being signed, currently the tracker has a functionality to allow calling write methods in arbitrary contracts but doesnt yet support payable methods.

Payable methods can be identified in the ABI (score API) with the payable field, here is an example of how the registerPRep method looks in the score API of the chain contract

curl -X POST --data '{"jsonrpc":"2.0","method":"icx_getScoreApi","params":{"address":"cx0000000000000000000000000000000000000000"},"id":604}' https://lisbon.net.solidwallet.io/api/v3 | jq
 
{
  "jsonrpc": "2.0",
  "result": [
    {
      "inputs": [
        {
          "name": "name",
          "type": "str"
        },
        {
          "name": "email",
          "type": "str"
        },
        {
          "name": "website",
          "type": "str"
        },
        {
          "name": "country",
          "type": "str"
        },
        {
          "name": "city",
          "type": "str"
        },
        {
          "name": "details",
          "type": "str"
        },
        {
          "name": "p2pEndpoint",
          "type": "str"
        },
        {
          "default": null,
          "name": "nodeAddress",
          "type": "Address"
        }
      ],
      "name": "registerPRep",
      "outputs": [],
      "payable": "0x1", # field that identifies the method as payable
      "type": "function"
    },
    ...
  ],
  "id": 604
}

adding support for these methods requires

• identifying if the method is payable or not
• if the method is payable add a new field called "value" to allow the user to add the amount of ICX being send
• convert the value from ICX into loop units and the convert to a hex string
• correctly adding the value in the JSON RPC payload being sent to the wallet for signage and then sending the transaction