message: feat(samples): increase logging client scope
  Don't instantiate Logging client every function invocation. b/141366779
diff: 'use strict';
  // [START logging_quickstart]
  +// Imports the Google Cloud client library
  +const {Logging} = require('@google-cloud/logging');
  +
  async function quickstart(
  projectId = 'YOUR_PROJECT_ID', // Your Google Cloud Platform project ID
  logName = 'my-log' // The name of the log to write to
  ) {
  - // Imports the Google Cloud client library
  - const {Logging} = require('@google-cloud/logging');
  -
  // Creates a client
  const logging = new Logging({projectId});
  