Extend Yola client with new WLTaskResourceMixin

[serhii-karelov]

Closes https://github.com/yola/yolapy/issues/80

Summary:

• Add resources.wl_task.WLTaskResourceMixin with the following methods:
  • complete_wl_task(wl_task_id)
  • fail_wl_task(wl_task_id, reason)
• Extend Yola with the new WLTaskResourceMixin.

Note: There are integration tests. Unfortunately, we do not have a partner endpoint to create a WL Task. Thus it makes hard to test thing in integration. That's why integration tests for the new resource have not been added.

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