For https://github.com/fleetdm/fleet/issues/37261
Changes:
- Added a new database model: `FleetInstanceUsingVpp`
- Added `/api/vpp/v1/register`: An API endpoint that validates provided
Fleet license keys, creates a database record for the proxy
registration, and returns a generated secret used to authenticate
requests to the other VPP proxy endpoint
- Added `/api/vpp/v1/metadata/:storeRegion`: An API endpoint that
forwards requests to the
`https://api.ent.apple.com/v1/catalog/${storeRegion}/stoken-authenticated-apps`
Apple API with a token generated using Fleet's Apple developer
credentials.
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Co-authored-by: Ian Littman <iansltx@gmail.com>
