cud relationship defs

[rocktavious]

Resolves #

Problem

There was no way to create, update or delete realtionship definitions

Solution

Add ability to do this

Checklist

• I have run this code, and it appears to resolve the stated issue.
• This PR does not reduce total test coverage
• This PR has no user interface changes or has already received approval from product management to change the interface.
• Does this change require a Terraform schema change?
  • If so what is the ticket or PR #
• Make a changie entry that explains the customer facing outcome of this change