Add default code to alarm_control_panel

[gjohansson-ST]

Proposed change

This adds setting a default code to alarm_control_oanel
Decided in home-assistant/architecture#892

Frontend PR: home-assistant/frontend#20062

Dev blog post: home-assistant/developers.home-assistant#2191

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)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

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• Tests have been added to verify that the new code works.

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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (alarm_control_panel) you are listed as a code owner for? Thanks!

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[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[emontnemery]

Why is this changed?

[gjohansson-ST]

These integrations doesn't require a code for their methods but was by not implementing code_arm_required actually setting it to True.
We are with this PR introducing validation for code so without setting this property to False these integrations would require a code input from the user.
See blog post link in the PR description.

[emontnemery]

Thanks, @gjohansson-ST 👍

[emontnemery]

Can be merged when the frontend PR is approved