[Feature]: uml4net.Extensions -> generate IComparers for each Concrete interface

[samatstariongroup]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of the SysML2.NET
• I have searched open and closed issues to ensure it has not already been reported

Description

code generate:

• IEqualityComparer for each concrete UML class:
  - ignore derived and redefined properties
  - anchor equality on the stable identity first (e.g., Id/Iid), then compare properties.
  - Add Diff function to comparer (see snippet below)
• Generate a static polymorphic root comparer (for mixed lists)

Sample code - (refine if necessary -> optimize for runtime performance)

public static IEnumerable<string> Diff(IElement a, IElement b)
{
    if (a.Id != b.Id) yield return $"Id: {a.Id} != {b.Id}";
    if (a.Name != b.Name) yield return $"Name: '{a.Name}' != '{b.Name}'";
    // ...
}

Sample code - (refine if necessary -> optimize for runtime performance)

public sealed class Comparer : IEqualityComparer<IData>
{
    private readonly IReadOnlyDictionary<Type, IEqualityComparer<IData>> interfaceComparers;

    public Comparer(IReadOnlyDictionary<Type, IEqualityComparer<IData>> interfaceComparers)
        => this.interfaceComparers = interfaceComparers;

    public bool Equals(IData? x, IData? y)
    {
        if (ReferenceEquals(x, y)) return true;
        if (x is null || y is null) return false;

        var ix = PickInterface(x);
        var iy = PickInterface(y);

        if (ix != iy) return false;

        if (!interfaceComparers.TryGetValue(ix, out var c))
            throw new NotSupportedException($"No comparer registered for interface {ix.FullName}");

        return c.Equals(x, y);
    }

    public int GetHashCode(IData obj)
    {
        var i = PickInterface(obj);
        var id = TryGetId(obj);
        return HashCode.Combine(i, id);
    }

    private static Type PickInterface(IData obj)
    {
        var t = obj.GetType();
        foreach (var i in InterfacePriority)
        {
            if (i.IsAssignableFrom(t))
                return i;
        }

        throw new NotSupportedException($"Unable to map runtime type {t.FullName} to a known DTO interface.");
    }

    private static object? TryGetId(IData obj)
        => obj switch
        {
            IHasId h => h.Id,
            _ => null
        };
}