Add Exit/Entry Delay Support for IAS ACE Alarm Panels

[malywut]

This PR adds exit and entry delay functionality to ZHA's IAS ACE alarm control panel implementation. Users can now configure countdown timers that:

• Give time to exit before the alarm arms (exit delay)
• Provide a grace period to disarm without triggering (entry delay)
• Display countdown status on physical Zigbee keypads

Why is this needed? Standard alarm systems use exit/entry delays for practical security:

• Exit delays let you leave after arming without triggering
• Entry delays let you disarm when entering before the alarm sounds
• Physical keypads need to show countdown timers and status

Without this, ZHA alarm panels had to arm/trigger instantly, which isn't practical for real-world use.

No breaking changes: All delays default to 0, preserving existing behavior.

[malywut]

Fixes issue #524, feature request https://community.home-assistant.io/t/zha-delay-arming/311361, related to zigpy/zha-device-handlers#2964

[malywut]

This PR is required for home-assistant/core#163709

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.49%. Comparing base (558bc6f) to head (1f44313).
⚠️ Report is 6 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #664      +/-   ##
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+ Coverage   97.41%   97.49%   +0.07%     
==========================================
  Files          62       62              
  Lines       10724    10811      +87     
==========================================
+ Hits        10447    10540      +93     
+ Misses        277      271       -6     

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[puddly]

Thank you for the PR!

@TheJulianJES @dmulcahey do you have any thoughts on making this config global? A possible alternative would be to make these configuration options tied to individual IAS ACE alarm panel devices?

[malywut]

@puddly
My thoughts: master_code, failed_tries, arm_requires_code are already global, so it made sense to add the exit delays there. Having multiple independent alarm systems on a single ZHA network with different delay requirements seems a very niche use case?

For the entry delay its different: you can expect different delays for different devices (windows trigger alarm immediately, doors leave a delay so that the user can input their code or swipe their key).
I just realized though that my implementation for entry delays was inconsistent: I started working on it as a global config, then didn't go through because it didn't make sense. I think I'll remove it entirely from the global config.