Add IntelliJ Run Configurations

[picimako]

Added IntelliJ run configurations for each Gradle commands mentioned in CONTRIBUTING.md.

References

#2273

Submitter checklist

• The PR request is well described and justified, including the body and the references
• The PR title represents the desired changelog entry
• The repository's code style is followed (see the contributing guide)
• Test coverage that demonstrates that the change works as expected
• For new features, there's necessary documentation in this pull request or in a subsequent PR to wiremock.org

[picimako]

@tomakehurst Thank you. I'll make the changes soon.
Do you want me to update the commands in CONTRIBUTING.md as well?

[tomakehurst]

@tomakehurst Thank you. I'll make the changes soon. Do you want me to update the commands in CONTRIBUTING.md as well?

Yes please, I think it would make sense for these to be consistent.

[oleg-nenashev]

LGTM, thanks!

[oleg-nenashev]

Will merge after the flaky CI passes.
It would be nice to extend https://github.com/wiremock/wiremock/blob/master/CONTRIBUTING.md and mention this tooling there (and WireMocha too if reasonable for test development?)

[picimako]

@oleg-nenashev I'll create a separate PR in the upcoming days to mention the run configurations in CONTRIBUTING.md.
Also, I'll look into the tests in WireMock to see if WireMocha could be utiltized there in any way.