Implement better factory access patterns for Random class

[konard]

Summary

This PR implements better factory access patterns for the Random class as requested in #5, providing multiple ways to access Random instances with improved thread safety and flexibility.

Changes Made

• Enhanced RandomHelpers class with multiple factory patterns:

  • Default property: Thread-safe lazy initialization using Lazy<T>
  • ThreadLocal property: Thread-local Random instances for multi-threaded scenarios
  • Create() method: Creates new Random instances with system time seed
  • Create(int seed) method: Creates new Random instances with specific seed
  • CreateSecure() method: Creates cryptographically secure random number generators

• Full backwards compatibility: The existing RandomHelpers.Default property continues to work exactly as before

• Comprehensive test coverage: Added tests for all new factory methods including thread safety verification

Key Improvements

1. Thread Safety:

   • Default property now uses Lazy<T> for thread-safe lazy initialization
   • ThreadLocal property provides thread-local instances for concurrent scenarios

2. Flexibility: Multiple factory methods allow choosing the most appropriate Random instance for different use cases

3. Security: CreateSecure() method provides access to cryptographically secure random generation

4. Performance: Lazy initialization prevents unnecessary object creation until actually needed

Test Plan

• All existing tests continue to pass (backwards compatibility verified)
• New tests cover all factory methods
• Thread safety tests verify ThreadLocal behavior
• Seed-based factory method tests verify deterministic behavior
• Secure random factory method tests verify proper instantiation

Fixes #5

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