[Generate] GraphQL schema

[samatstariongroup]

Prerequisites

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

Description

Generate, based on the ecore meta model, a GraphQL schema to be used in a dgraph dbase. Verify that the schema is correct on a local dgraph instance

Steps to Reproduce

NA

System Configuration

• SysML2.NET version:
  • [x] SysML2.NET: 0.8.0