CorePeripherals: Target Tree Structure

[thorstendb-ARM]

Hierarchical Core Peripherals

This PR introduces hierarchical grouping for the Core Peripherals tree view. Core peripherals like SysTick and NVIC can exist in multiple variants (Secure/Non-Secure with TrustZone, or per-core in multi-core systems). Instead of a flat list, the tree now supports up to three grouping levels:

Single-core without TrustZone — flat list (no change)
Single-core with TrustZone — peripheral → Secure / Non-Secure
Multi-core — core → peripheral → (optional S/NS variants)
For the full design document, see hierarchical-core-peripherals.md.

Ref

#239

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Checklist

• 🤖 This change is covered by unit tests (if applicable).
• 🤹 Manual testing has been performed (if necessary).
• 🛡️ Security impacts have been considered (if relevant).
• 📖 Documentation updates are complete (if required).
• 🧠 Third-party dependencies and TPIP updated (if required).