code: function workersUrl(workspaceSid, workerSid) {
    return _.join(
      _.filter([workspacesUrl(workspaceSid), 'Workers', workerSid], _.isString),
      '/'
    );
  }
docs: Generate TaskRouter worker url
  
  @param {string} workspaceSid workspace sid
  @param {string} [workerSid] worker sid or '**' for all workers
  @returns {string} generated url