Add Jupyter Notebook Support for SageMath

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This PR implements comprehensive Jupyter notebook support for SageMath, addressing the user request for SageMath code highlighting and execution capabilities in VS Code notebooks.

Key Features Added

Notebook Kernel Support

• SageMath Notebook Controller: A dedicated kernel that enables executing SageMath code directly in Jupyter notebook cells
• Cell Execution: Seamless execution of SageMath code with proper output handling and error reporting
• Execution Order: Supports proper cell execution ordering and lifecycle management

Enhanced Language Support

• Syntax Highlighting: SageMath syntax highlighting automatically works in notebook cells
• IntelliSense: Existing language features extend to notebook contexts
• Multi-language Support: Supports both 'sage' and 'python' language modes in notebooks

Configuration & Integration

• Unified Settings: Reuses existing extension configuration (interpreter path, WSL support)
• Toggle Control: New sagemathEnhanced.notebookKernelEnabled setting to enable/disable notebook functionality
• Cross-platform: Full support for Windows (with WSL), macOS, and Linux

Technical Implementation

The implementation adds a SageMathNotebookController class that:

• Registers as a VS Code notebook controller for Jupyter notebooks
• Creates temporary .sage files for each cell execution
• Uses the existing SageMath interpreter infrastructure
• Handles proper cleanup of temporary files
• Provides robust error handling with informative messages

Usage

1. Open any .ipynb file in VS Code
2. Select "SageMath" from the kernel picker
3. Write SageMath code in cells with full syntax highlighting
4. Execute cells to run SageMath code and see results

Example

# Symbolic mathematics in notebook cells x = var('x') f = x^3 - 2*x^2 + x - 1 print(f"Function: {f}") print(f"Derivative: {diff(f, x)}") factor(f)

The implementation maintains full backward compatibility with existing .sage file functionality while adding the requested notebook capabilities.

Fixes #1.

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