Update CLI attribute definitions CRUD commands

[jrschumacher]

Add CLI commands for CRUD of attribute-definition. Commands:

• create
• get
• list
• update ^{1 2}
• delete ³

Acceptance Criteria

• add CRUD commands
• use flags to drive properties for create and update
  • cmd create --property <prop-value>
  • cmd update --property <prop-value>
• use flags to drive selectors for get and list (if exists)
  • cmd get --status inactive
  • cmd list --status inactive
• leave test instructions as issue comment

Footnotes

1. Update might not have the same properties as create ↩

2. Update behaves like a partial update ↩

3. Deletion might be soft-delete in nature ↩