Code completion for serve event listeners

[picimako]

Summary

WireMock has built-in and extension-provided serve event listeners. For better discovery and more efficient usage, code completion could be utilized.

Tasks

• Implement code completion for serve event listener names. Candidates:
  • webhooks
  • listeners in the wiremock-state-extension
• Upon selecting a completion item, in addition to inserting the listener name, it also should generate the mandatory JSON properties of the listener.
• Additionally, it should also position the caret to the first mandatory property for better user experience.

[picimako]

Completed in v1.0.23.