Convert internal Arrays to Vectors for better performance

[Copilot]

This PR converts internal Array usage to Vector for improved performance while maintaining backward compatibility.

Changes

1. Changed internal storage from Array to Vector:

   • Vector.<Class> for _valueClasses in MonoSignal and OnceSignal
   • Vector.<Object> for _params in Slot
   • Updated NativeMappedSignal to properly handle Vectors

2. Maintained backward compatibility:

   • All public methods still accept and return Arrays
   • Added conversion functions between Arrays and Vectors
   • Added null checks for Vectors to ensure stability
   • No changes to public interfaces (ISignal, IOnceSignal)

Benefits

• Better performance: Vectors are more efficient than Arrays for typed collections
• Type safety: Vector.<Class> provides compile-time type checking
• Identical API: All existing code using the library will continue to work

This addresses the request to use the more efficient Vector.<> type internally instead of Arrays, while keeping backward compatibility with existing code.

Fixes #66.

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