Add JSDoc documentation and universal exports

[WavePlayz]

This commit introduces two key improvements to the Blake2B implementation:

1. Comprehensive JSDoc Documentation:

• Added JSDoc comments for all functions and classes
• Documented parameters, return values, and exceptions
• Maintained all original inline comments and explanations
• Added type information for better IDE support
• Documented the Blake namespace and its methods
• Improved input parameter documentation for normalizeInput()

2. Universal Export Pattern:

• Added robust environment detection for exports
• Supports CommonJS (Node.js), AMD, and browser globals
• Uses globalThis with fallbacks to window/self
• Maintains backward compatibility
• Provides cleaner consumption in all environments

The original functionality remains completely unchanged - these are improvements to documentation and module exports.

All original comments from the reference implementation have been preserved exactly as they were, including:

• RFC reference comments
• Performance optimization notes
• Debugging helper comments
• Example usage in comments
• Core algorithm explanations

The changes make the code:

• Better documented for maintainers
• More tooling-friendly (IDEs, TypeScript)
• Easier to consume in different environments
• More future-proof while maintaining compatibility