[Feature]: implement xmi deserializer

[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 SysML2.NET.Serializer.Xmi project and associated test project
• add reader and writer interface similar to Json serializer project
• add generated xmi reader classes using uml4net as template to implement -> writer is in [Feature]: implement xmi serializer #56
• verify using the Sysml libraries (xml population)