Add Conditional Access Policy sync and helpers

[TecharyJames]

Introduce full support for syncing Microsoft 365 Conditional Access Policies (CAPs) into ITGlue and refactor ITGlue sync logic for more efficient updates.

Changes:

• Added private helpers: Add-ITGlueFlexibleAssetFields (batch-add flexible asset fields), Format-ITGlueCAPValue (format newline lists), and Sync-ITGlueConditionalAccessPolicies (create/update/delete CAP flexible assets, HTML details, hash-based change detection, caching).
• Extended Get-ITGlueFieldMapping to include ConditionalAccessPolicies mapping key.
• Heavily refactored Invoke-ITGlueExtensionSync to:
  • Use a centralized asset cache table and hash-based detection to skip unchanged assets (users, devices, CAPs). Timestamps are excluded from hashes so only real content changes trigger updates.
  • Batch field additions via Add-ITGlueFlexibleAssetFields and auto-create a Conditional Access Policy flexible asset type if missing.
  • Support create/update/delete flows for users, devices, configurations and CAP flexible assets, with cache maintenance and improved logging/metrics (updated vs unchanged counts).
  • Improve HTML quick-notes replacement logic for organization overview.

Why: reduce unnecessary API calls and updates, add CAP syncing capability, and simplify management of flexible asset fields and change detection.