Separate out multiple errors when errors occur during a request.

[googlecloudplatform]

Separate out multiple errors when errors occur during a request.

[mservidio]

For loading the file and the query transformation, errors can be accessed within the array job.status.errors. We need to do some re-factoring to catch any thrown errors as await is used now though.

IE: https://github.com/googleapis/nodejs-bigquery/blob/master/samples/loadCSVFromGCSTruncate.js

Should be a simple update to iterate the array and write each individual array out to the console.

cc: @salsferrazza

[mservidio]

Addressed in #43 for file loading errors.