Add device security verification guide

- Introduced a comprehensive guide for verifying the security configuration of provisioned Raspberry Pi devices, covering secure boot enforcement, firmware version checks, device-specific encryption key validation, encryption key usage, and JTAG status verification.
- Included detailed prerequisites, verification procedures, and troubleshooting tips to assist users in ensuring device security compliance.
- Added an automated verification script and API-based verification methods for enhanced usability and efficiency in security checks.

Author: tdewey-rpi