[Feature]: Implement StateDefinitionExtension

[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

The StateDefinitionExtensions class in SysML2.NET/Extend/StateDefinitionExtensions.cs contains 4 extension method(s) that compute derived properties for the IStateDefinition interface. These methods currently throw NotSupportedException and need to be implemented.

Checklist

• IActionUsage ComputeDoAction(this IStateDefinition)
• IActionUsage ComputeEntryAction(this IStateDefinition)
• IActionUsage ComputeExitAction(this IStateDefinition)
• List<IStateUsage> ComputeState(this IStateDefinition)

System Configuration

• SysML2.NET version: 0.19.0
• Source file: SysML2.NET/Extend/StateDefinitionExtensions.cs