build: run javadoc linter in local testing and CI

[Totktonada]

I recently found that I'm unable to prepare a release (mvn release:clean release:prepare -DpushChanges=false) because of javadoc linter errors (see PR #243). It would be good to catch those errors (and also warnings) during development.

I don't know how to run a javadoc linter separately from release:prepare. Maybe we need to extract necessary parts of oss-parent POM to our POM file: if so, this issue looks connected with #241.