Make Count method an optimization by providing default implementation using Each

[konard]

Summary

This PR addresses issue #53 by making the Count method an optimization rather than a basic method. The solution provides a default implementation in the ILinks interface that uses the Each method to count links.

Changes Made

• Added default implementation: The Count method now has a default implementation in the interface that uses the Each method to count matching links
• Added documentation: Added remarks explaining that this is an optimization method that can be overridden for better performance
• Preserved compatibility: All existing code continues to work without changes

Technical Details

The default implementation:

TLinkAddress Count(IList<TLinkAddress>? restriction)
{
    var counter = TLinkAddress.Zero;
    Each(restriction, link =>
    {
        counter++;
        return Constants.Continue;
    });
    return counter;
}

This approach allows:

1. Basic functionality: Works out of the box for any implementation that provides Each
2. Optimization opportunity: Implementations can override this method with more efficient counting mechanisms
3. Backward compatibility: All existing code continues to work

Testing

• All existing tests pass ✅
• Build completes successfully ✅
• No breaking changes introduced ✅

Related

Fixes #53

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