Make connect compatable with kafka plugin.discovery

[joswlv]

What is Plugin Discovery.

When connector is used with kafka version above 3.6 with default plugin.discovery worker configuration there would be a warning

org.apache.kafka.connect.runtime.isolation.Plugins","message":"One or more plugins are missing ServiceLoader manifests may not be usable with plugin.discovery=service_load: [
...
Read the documentation at https://kafka.apache.org/documentation.html#connect_plugindiscovery for instructions on migrating your plugins to take advantage of the performance improvements of service_load mode. To silence this warning, set plugin.discovery=only_scan in the worker config.