[Add] uml like metadata to classes and properties

[samatstariongroup]

Prerequisites

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

Description

Add metadata to classes and properties as as in done in the COMET-SDK to self document relationships etc.

Steps to Reproduce

NA

System Configuration

NA

• ReqIFSharp version:
  • [x] ReqIFSharp: 5.0.0-rc2