Add UI for model management

[cdmgtri]

Create a user interface to allow an approved data modeler to add, edit, and delete model content.

Requirements:

• [ ] User logs in
• [ ] Tool displays lists of model versions and/or namespaces that user has permission to edit
• [ ] User selects an editable version
• [ ] Tool displays add button on item section pages
• [ ] Tool displays edit and delete buttons on item detail pages, accessible via searching or browsing
• [ ] Tool makes fields on item detail pages editable
• [ ] Tool add instructions and validation for fields
• [ ] User makes changes and clicks to submit
• [ ] Tool checks for dependency issues
• [ ] Tool checks for basic QA issues
• [ ] Tool runs the API's model management services to update the model
• [ ] Pass: User with version editing permissions can make changes to that specific draft version
• [ ] Fail: User cannot make changes if not logged in
• [ ] Fail: User cannot make changes to a version without editing permissions
• [ ] Fail: User cannot make changes to a version that has been published (no longer open)
• [ ] Fail: User cannot add an item with the same identifier