Add checkstyle tests

[alexjpwalker]

No description provided.

[izmalk]

Could you provide a little bit of description? To understand what is this about. Scripts to check for mistakes in docs? If so, then it's more suitable for web-docs repo

[alexjpwalker]

Could you provide a little bit of description? To understand what is this about. Scripts to check for mistakes in docs? If so, then it's more suitable for web-docs repo

Checkstyle is a tool that validates Java code style. It also verifies that all files in a repo have the correct license headers attached. We have it in all major @vaticle repos. You can find it by searching a repo such as typedb for the term checkstyle_test. It should be in docs, too.