Add synchronous start task API endpoint

[mountaindude]

Sometimes you want to start a task and then check in on it, making sure it completes without errors.
The curent task//start endpoint does not support this though.

Add a new endpoint task//start/sync that uses the QRS sync endpoint instead of the async one.

The new endpoint should return the session ID, which can then be used to check progress.
The endpoint should accept a JSON as parameter in the body, to support future enhancements (e.g. Butler-managed monitoring of the reload task, alerts on failure etc)

[github-actions[bot]]

This issue is stale because it has been open for 30 days with no activity.