JBIDE-17233 - Add usage tracking for the WS Tester

Added a new UsageEventType to count the number of 'invoke' on the Web Service Tester,
with a 'label' set to the selected value in the combobox (JAX-WS, GET, POST, PUT, DELETE or OPTIONS)
Counting the event for every invoke of JAX-WS and JX-RS style of requests