Add endpoint to retrieve OS updates config

[roperzh]

Related user story

• https://github.com/fleetdm/fleet/issues/9013

Task

Add an endpoint to get the currently configured minimum_version and deadline set by #9345 .

• Path: GET /api/_version_/fleet/mdm/apple/config
• Accepts a team_id parameter to get the config for a specific team

[roperzh]

Hey team! Please add your planning poker estimate with Zenhub @mna @gillespi314

[fleet-release]

.

Haiku: Safety is sought,
By setting a version goal.
Peace of mind is found.