Non-informative error message when API key is missing or incorrect

[vitalir-xops]

When the auth key is invalid the sdk throws a generic exception with non-informative error message which makes these kind of errors hard to catch.

Version: "shipengine": "^1.0.7",

Code example:

import { ShipEngine } from "shipengine";
const config = {
  apiKey: "TEST",
}

const addresses = [
  {
    name: "John Smith",
    companyName: "ShipStation",
    addressLine1: "3800 N Lamar Blvd",
    addressLine2: "#220",
    cityLocality: "Austin",
    stateProvince: "TX",
    postalCode: "78756",
    countryCode: "US",
    addressResidentialIndicator: "no",
  },
]
let shipengine = new ShipEngine(config);
const result = await shipengine.validateAddresses(addresses);

error message:

Error validating address:  response.map is not a function
Error validating address:  TypeError: response.map is not a function
    at Object.formatResponse (<path>/node_modules/shipengine/cjs/validate-addresses/format-response.js:5:21)
    at Object.validateAddresses (<path>/node_modules/shipengine/cjs/validate-addresses/index.js:19:30)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async validateAddresses (<path>/agent.js:20:20)
    ...