feat: Enhance mathematical utilities and add string processing functions

- Added a new math.zig file containing various mathematical functions including complex numbers, statistics, and matrix operations.
- Introduced utils.zig for string processing utilities, including email validation and string manipulation functions.
- Updated main.zig to utilize new utility functions and demonstrate their usage.
- Enhanced root.zig with error handling, configuration management, and generic functions.
- Added comprehensive tests for all new functionalities to ensure correctness and reliability.

Author: johnhuang316