Add noise module

[waynemwashuma]

Objective

Move noise module from the geometry module to a dedicated top-level noise module.

This reorganization was taken because:

• Noise generation is a distinct domain from geometric operations
• It follows the principle of separation of concerns
• It creates a clearer module hierarchy for future expansion
• It makes the codebase more maintainable and easier to navigate

Solution

Move noise module to top level.

Showcase

N/A

Migration guide

N/A

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.