[Feature]: add generated C# attribute to the Extend methods to distuingis between Derived properties and Operations

[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

add a c# attribute to the derivedproperty implementation and operation implementation extension methods to make it explicit what these methods are for.