feat(bufio): Add React Native compatibility fixes

[matthewjablack]

Summary

This PR adds React Native compatibility to the @node-dlc/bufio package while maintaining full backward compatibility with Node.js environments.

Changes Made

1. Function Name References → String Literals

• Replaced this.methodName.name with string literals (e.g., 'readUInt8')
• Why: React Native minifiers can mangle function names, causing runtime errors
• Impact: Zero performance impact in Node.js, fixes compatibility in React Native

2. BigInt Performance Optimization

• Replaced BigInt(2) ** BigInt(64) with BigInt('18446744073709551616')
• Why: Eliminates runtime exponentiation calculation and improves React Native compatibility
• Impact: Better performance in all environments

3. Buffer.copy() Compatibility

• Added feature detection for Buffer.copy() method with manual fallback
• Why: React Native Buffer polyfills may not implement the copy() method
• Impact: Zero overhead in Node.js (native copy used), manual fallback in React Native

Compatibility

• Node.js: All changes are backward compatible, native methods still used
• React Native: Now works without requiring post-install patches
• Performance: No degradation in Node.js, improvements in some cases

Testing

• All existing tests pass
• Changes use feature detection rather than environment detection
• Maintains identical behavior across all supported environments

Files Changed

• packages/bufio/lib/BufferReader.ts
• packages/bufio/lib/BufferWriter.ts

This eliminates the need for manual patches when using the library in React Native applications.