Add data/data_template/title to alert component

[syphernl]

Description:

Pull request in home-assistant.io with documentation (if applicable): home-assistant/home-assistant.io#6968

Example entry for configuration.yaml (if applicable):

# Example configuration.yaml entry
alert:
  garage_door:
    name: Garage is open
    entity_id: input_boolean.garage_door
    state: 'on'   # Optional, 'on' is the default value
    repeat:
      - 15
      - 30
      - 60
    can_acknowledge: True  # Optional, default is True
    skip_first: True  # Optional, false is the default
    title: 'Garage'
    data:
      data:
        inline_keyboard:
          - 'Close garage:/close_garage, Acknowledge:/garage_acknowledge'
    notifiers:
      - frank_telegram

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.io

[homeassistant]

Hi @syphernl,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[syphernl]

The tox tests are failing, not sure why though. Any pointers?

[cgarwood]

https://travis-ci.org/home-assistant/home-assistant/jobs/443714441#L1098 - you added extra arguments to the init function, the tests will need to be updated to include those.

[MartinHjelmare]

Is this PR clashing with #17516?

[balloob]

It did. Pr should be rebased

[thoscut]

I would decouple the extended template handling from the changes to the alert component, as this would be helpful for other templates as well.