Add Image Inspection Functionality to boot_status.py

[aidangarske]

Unified wolfBoot Utility Tool

This PR consolidates wolfBoot Python scripts into a single unified utility tool, addressing feedback from PR #621.

Changes

Merged three tools into a unified boot_status.py with subcommands:

Image Operations (from image-peek.py):

• boot_status.py image inspect - Display image header, version, timestamp, hash, signature
• boot_status.py image verify - Verify image hash and signature with public key
• boot_status.py image dump - Extract payload from signed image

Keystore Operations (from keystore-to-spki.py):

• boot_status.py keystore convert - Convert wolfBoot keystore.der to SPKI DER/PEM format
  • Supports ECC p256/p384/p521 curves with auto-detection
  • Handles multiple input formats: raw X||Y, SEC1, wolfBoot 16+X||Y container, SPKI DER

Boot Status Operations (original boot_status.py):

• boot_status.py status get - Read partition boot status (BOOT/UPDATE)
• boot_status.py status set - Set partition status (NEW/UPDATING/SUCCESS)

[Copilot]

Pull request overview

This PR consolidates three standalone Python tools (boot_status.py, image-peek.py, and keystore-to-spki.py) into a single unified boot_status.py utility with a subcommand-based CLI interface, improving tool organization and user experience.

Key Changes:

• Refactored original boot status management into status get and status set subcommands
• Added image operations subcommands (image inspect, image verify, image dump) for analyzing wolfBoot signed images
• Added keystore conversion subcommand (keystore convert) for transforming wolfBoot keystores to SPKI DER/PEM format

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