Add extensionScanningEnabled option to @WireMockTest.

[kyle-winkelman]

When using extensions that utilize service loading (e.g. wiremock/wiremock-graphql-extension) it would be preferable to use the declarative option to enable extension scanning, rather than being forced to use the programmatic approach to manually define extensions.

References

• https://github.com/wiremock/wiremock/pull/2561

Submitter checklist

• [x] The PR request is well described and justified, including the body and the references
• [x] The PR title represents the desired changelog entry
• [ ] If the change against WireMock 2 functionality (incompatible with WireMock 3), it is submitted against the 2.x branch
• [x] The repository's code style is followed (see the contributing guide)

Details: Contributor Guide

[tomakehurst]

Thanks!