Vacation Mode on Alarm Panels

[posixx]

Proposed change

• Implements feature request https://community.home-assistant.io/t/alarm-control-panel-vacation-mode/213872/2
• already discussed in architectual repo: alarm-control-panel: Vacation Mode architecture#500
• new constants are introduced (const.py) following naming of existing alarmpanel constants

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

Additional information

• Link to dev documentation pull request: Document alarm control panel vacation mode developers.home-assistant#758
• Implements https://community.home-assistant.io/t/alarm-control-panel-vacation-mode/213872/2 and includes MQTT Alarmpanel changes

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

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

Proof of working vacation mode:

[posixx]

is it possible someon takes over ownership of this PR? I am committing things to solve but have no idea what i am doing... I think i make things worse..

[github-actions]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days.
Thank you for your contributions.

[posixx]

When is this proposed change merged into the core? It's ready about one month now..

[github-actions]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days.
Thank you for your contributions.

[emontnemery]

Looks good, thanks a lot @posixx and @KJonline 👍

The comments have been addressed