[Feature]: Implement ElementExtensions #121

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

The ElementExtensions class in SysML2.NET/Extend/ElementExtensions.cs contains 11 extension method(s) that compute derived properties for the IElement interface. These methods currently throw NotSupportedException and need to be implemented.

Checklist

• List<IDocumentation> ComputeDocumentation(this IElement)
• bool ComputeIsLibraryElement(this IElement)
• string ComputeName(this IElement)
• List<IAnnotation> ComputeOwnedAnnotation(this IElement)
• List<IElement> ComputeOwnedElement(this IElement)
• IElement ComputeOwner(this IElement)
• IOwningMembership ComputeOwningMembership(this IElement)
• INamespace ComputeOwningNamespace(this IElement)
• string ComputeQualifiedName(this IElement)
• string ComputeShortName(this IElement)
• List<ITextualRepresentation> ComputeTextualRepresentation(this IElement)

System Configuration

• SysML2.NET version: 0.19.0