Added "transfer()" commands to token cost analysis

[auroter]

To test:

1. In Postman Dashboard API or Postgres, ensure that the "transfer(address,uint256)" command is allowed for the String Avalanche USDc contract. I can send you some if you don't have any yet.

2. In Postman String-API Get a quote for the transfer, i.e.:

{
	"userAddress": "{{wallet_address}}",
    "assetName": "String DEV Exchange Fuji",
	"chainID": 43113,
    "actions": [
        {
        "contractAddress": "0x671E35F91Cc497385f9f7d0dFCB7192848b1015b",
        "contractFunction": "transfer(address,uint256)",
        "contractReturn": "",
        "contractParameters": ["{{wallet_address}}","2 eth"],
        "txValue": "0",
        "gasLimit": "800000"
        }
    ]
}

3. Note that the TokenCostUSD reflects the amount being transferred

4. Execute the quote and verify that the TX is successful

[brianspierce]

Followed test procedure and verified that endpoint behaves as expected.