[Swift] Add Alerts to Samples

[asthatrivedi]

This ticket is to provide guidance on how to use Alerts by using them in different scenarios inside Samples. This is a part of a larger initiative to create a sample that uses Modals, Alerts and other container screens (coming in future) together. Recently Modals were added to Samples under the same initiative.

This ticket will cover following tasks:

• Extract internal version of WorkflowAlertContainer and mold it for open source.
• Make a podspec file for this container like BackStackContainer and ModalContainer.
• Extend the sample TicTacToe to use this new pod for scenarios: Authentication failure and An extra confirmation pop up when user confirms to quit the game.

[asthatrivedi]

PR merged to master.