Replace sync_to_async with database_sync_to_async

[smk4664]

This change allows the Slack Socket Mode to properly close and reopen the database connection when finished processing a command.

Closes: #355

What's Changed

This PR introduces Channels.db.database_sync_to_async to resolve issue where the Asynchronous thread does not properly close and reopen database connections. This does not require adding Channels to the INSTALLED_APPS in nautobot_config.py, nor does it require replacing the uwsgi worker like the Channels installation page shows.

To Do

• Explanation of Change(s)
• Added change log fragment(s) (for more information see the documentation)
• Attached Screenshots, Payload Example
• Unit, Integration Tests
• Documentation Updates (when adding/changing features)
• Outline Remaining Work, Constraints from Design

[glennmatthews]

Is there anything straightforward that can be added for unit/integration test coverage here or is it complex enough to remain in the realm of manual testing only for now?

[smk4664]

Is there anything straightforward that can be added for unit/integration test coverage here or is it complex enough to remain in the realm of manual testing only for now?

I believe this will be hard to recreate in tests. From what I have read, this is a safe change to do, and is built-in to Django.