Modify model edit template to better match NetBox typical model edit templates

[atownson]

Plugin Version

0.6.0

Proposed functionality

1. Group the "Owner group" and "Owner" inputs within the Ownership group.
2. Style the "Changelog message" input similar to NetBox.

Current template results:

Proposed results:

Use case

These changes would improve readability of the edit forms and align the forms with the styling presented in NetBox.

External dependencies

No response