Update dependencies and cleanup

[stanlemon]

This pull request does:

• Updates various dependencies in pom.xml
• Updates junit and kafka-junit to the v5 versions
• Fixed a bunch of checkstyle warnings around docs
• Removed asterisks from license header (IDE friendly)
• Updates copyrights
• Address some unchecked handling and improves typing on certain config objects

This pull request does NOT:

• Cleanup all of the Mockito matchers
• Resolve deprecated code issues, such as those with storm metrics
• Resolve unchecked handling in tests
• Updated curator dependencies (requires further testing)

I will open a followup PR with some of the does not items, this one has gotten too big already.

[Crim]

My only concerns are on the tests where .close() calls got moved out of finally blocks. Those took me ages to track down spots where .close() wasn't being called correctly leaving zombie processes running all over. We should just double check that even when the assertions fail, that close() gets called.

Should be simple to verify by just adjusting one of them to not throw the expected exception and see what happens.

[stanlemon]

Good catch on those finally blocks, I think I got those all back in now and addressed the other feedback as well.