Python package management system

[rgbkrk]

Implement Python package management system for pre-installing scientific stack and custom packages.

Current State: Pyodide package loading on-demand, can be slow
Target: Pre-installed scientific stack with package management capabilities

Implementation Tasks:

• Pre-install scientific stack (numpy, pandas, matplotlib, scipy, etc.)
• Package caching and management system
• Custom package installation support
• Package dependency resolution
• Environment management

Features:

• Pre-loaded scientific computing packages
• Faster startup with cached packages
• Custom package installation
• Package version management
• Environment isolation

TBD: Package caching strategy, environment management approach, custom package installation