* Add message field to ObjectChange model
* Set max length on changelog message
* Enable changelog messages for single object operations
* Fix tests
* Add changelog message support for bulk edit & bulk delete
* Cosmetic improvements to form fields
* Fix bulk operation templates
* Add message support for bulk import/update
* Add REST API support for changelog messages (WIP)
* Fix changelog_message assignment
* Enable changelog message support for bulk deletions
* Add documentation
* Fix changelog message support for VirtualChassis
* Add ChangeLoggingMixin to necesssary model forms
* Introduce get_random_string() utility function for tests
* Incorporate changelog messages for object view tests
* Incorporate changelog messages for object bulk view tests
* Add missing mixins for changelog message support
* Tweak test to generate expected number of change records
* Finish adding tests for changelog message functionality
* Misc cleanup
* Fixes#19956: Prevent duplicate deletion records from cascading deletions
* Tweak bulk deletion test to work around cascading deletions issue
* Correct API URL
