[FancyZones] Split zones-settings: layout templates

[SeraphimaZykova]

Summary of the Pull Request

What is this about:

• Keep layout templates in a separate file.
• Create layout-templates.json from zones-settings on FZ start
• Save templates in the layout-templates.json in Editor.
• Unit tests

What is included in the PR:

How does someone test / validate:

• Run PT, verify layout-templates.json created
• Run tests
• Open editor, edit any template, verify it was saved properly

Quality Checklist

• Linked issue: FancyZones forgets custom layouts after crashes #14782
• Communication: I've discussed this with core contributors in the issue.
• Tests: Added/updated and all pass
• Installer: Added/updated and all pass
• Localization: All end user facing strings can be localized
• Docs: Added/ updated
• Binaries: Any new files are added to WXS / YML
  • No new binaries
  • YML for signing for new binaries
  • WXS for installer for new binaries

Contributor License Agreement (CLA)

A CLA must be signed. If not, go over here and sign the CLA.