Retrieves the total supply of an ERC20 token.
GET //erc20/{account}/totalSupply HTTP/1.1
Host: beta.usemoon.ai
Authorization: text
Accept: */*
A promise that resolves to an ERC20APIResponse
containing the total supply of the token as a string.
{
"success": true,
"message": "text",
"data": "text"
}