BytteLoader: African Language Corpora Document Loader

[BytteData]

VulavulaClient Improvements

1. Added structured logging instead of print statements
2. Implemented input validation for API key
3. Added configurable timeout with default value (30s)
4. Pre-built headers in init for better performance
5. Enhanced error handling with specific exception types (Timeout, HTTPError, RequestException)
6. Added response parsing error handling
7. Introduced class constants for base URL and timeout
8. Improved docstrings with detailed Args, Returns, and Raises sections
9. Added optional custom base URL parameter for flexibility