Added Content Provenance notebook to canvas workshop

[bhavinjpatel]

Description of changes:

This PR adds support for Content Provenance (C2PA) features to the Amazon Nova Canvas Workshop.

1. New Content Provenance Notebook
   Added 08-content-provenance.ipynb which demonstrates:

• Automatic C2PA metadata embedding in generated images
• Metadata verification and validation
• Tracking provenance through image editing operations
• Visualization of manifest changes
• Integration with AWS's digital signatures

2. Enhanced Utils Module

Added new functions to utils.py:

• save_binary_image: Preserves C2PA metadata when saving images
• extract_c2pa_metadata: Extracts and parses C2PA manifests
• display_image_with_metadata: Visualizes images with their metadata
• verify_c2pa_metadata: Performs verification
• track_edit_provenance: Tracks and visualizes changes across edits
• Enhanced plotting functions to support metadata visualization

3. Prerequisites Update

Modified 00-NovaCanvas-prerequisites.ipynb:

• Added c2pa-python library installation
• Updated dependency list
• Maintained backward compatibility with existing requirements

4. Documentation Enhancement

Updated 01-text-to-image.ipynb:

• Added Content Provenance to features list

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