Feature Request/Idea: reload exporters API call

Overview of the Feature Request
Right now we need to restart the server after every change to the external exporters for them to take an effect. Especially the configuration-driven exporters, like Transformer Exporter for Dataverse, would benefit from a reloading functionality eliminating the need for restarting the server after the changes to the transformer or configuration, and causing short unavailability. A simple API endpoint that allows reloading all exporters would fix that.

What kind of user is the feature intended for?
(Example users roles: API User, Curator, Depositor, Guest, Superuser, Sysadmin)
Superuser, Sysadmin

What inspired the request?
The need to restart the server after adding/removing/re-configuring an external exporter

What existing behavior do you want changed?
None

Any brand new behavior do you want to add to Dataverse?
Add API endpoint for reloading exporters.

Any open or closed issues related to this feature request?
#8688

Start by reviewing related issue #8688 and the current exporter configuration and restart behavior described in this request. Done means defining and implementing an API endpoint that lets authorized superusers or sysadmins reload all external exporters without restarting the server or causing the stated short unavailability.