Improve Notifications

[hawkeye217]

Proposed change

This PR refactors and improves webpush/native notifications.

• Add ability to enable/disable/suspend notifications at the camera level.
• Add MQTT topics to enable/disable/suspend notifications per camera.
• Add ability to send a test notification from the UI.
• Add ability to suspend notifications per camera from the Notifications pane in the UI.
• Enqueue notification processing and use a thread to prevent the parent from blocking if push servers are down.
• Docs updates.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code
• Documentation Update

Additional information

• This PR fixes or closes issue:
  closes Ability to suspend message notifications per camera for period. #15445
  closes Notification tester #15171
• This PR is related to issue:

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.
• The code has been formatted using Ruff (ruff format frigate)

[netlify]

✅ Deploy Preview for frigate-docs canceled.

Name	Link
🔨 Latest commit	9f42d59
🔍 Latest deploy log	https://app.netlify.com/sites/frigate-docs/deploys/67aab7e4b965290008cb0213