Add CI job that checks/regenerates JavaStdlib etc with wrap-java

[ktoso]

We always want the "latest" version of those generated sources.

swift-java wrap-java generated sources inside SwiftJava and JavaStdlib should always be up to date.
if running a wrap run on a new commit changes the sources, we changed the wrap-java logic and we should audit that and/or regenerate the sources.

The CI job should make sure we don't regress features this way and that we always have the latest version of generated sources.

[JScodesconcise]

Can I work on this issue?

[ktoso]

Sure, happy to take contributions however you won’t be able to validate CI job changes since they’re only picked up from branches on the actual repo so it may be hard to verify…

It may be better to find a non CI task to work once since that you can actually verify better?

[JScodesconcise]

Got it.