Support for wiremock-pact

[picimako]

Summary

Investigate and add support for https://github.com/wiremock/wiremock-pact.

The original issue was about checking Atlassian's wiremock-pact-generator project.

Tasks

• [x] Default builder method argument values for se.bjurr.wiremockpact.wiremockpactlib.api.WireMockPactConfig
• [x] Convert WireMockPactConfig from JSON to Java in the stub mapping preview.
• [x] Regex language injection into:
  • [x] WireMockPactConfig.setIncludeRequestHeadersRegexp()
  • [x] WireMockPactConfig.setIncludeResponseHeadersRegexp()
• [x] Generate, via Alt+Insert menu, a WireMockPactExtension-type @RegisterExtension field.
  • [x] This should be available only when the wiremock-pact extension is configured in the project.

[picimako]

Completed in v1.0.27.