Add lg_netcast turn_on_action configuration variable

[maxcanna]

Proposed change

Allow to turn on the TV using an external service

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

  - platform: lg_netcast
    name: LGigi
    host: 192.168.0.70
    access_token: 123456
    turn_on_action:
      service: switch.turn_on
      data:
        entity_id: switch.lgigi

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request: Add lg_netcast turn_on_action configuration variable home-assistant.io#12075

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

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

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• Untested files have been added to .coveragerc.

The integration reached or maintains the following Integration Quality Scale:

• No score or internal
• 🥈 Silver
• 🥇 Gold
• 🏆 Platinum

[MartinHjelmare]

Looks good!

[maxcanna]

@MartinHjelmare I squashed the fixups 🙇

[MartinHjelmare]

Please don't squash commits after review has started to make it easier for readers to track changes. We'll squash when merging. 👍

[maxcanna]

Oh, sorry @MartinHjelmare I always pay attention to this. That's why I left them until you approved this PR. I'll leave them in the future 🙂

[MartinHjelmare]

I need to check your squashed commit too, so I basically have to go through the PR again and for a big PR it would mean a lot of work.

No worries! Thanks for your contribution and I hope to see more!