Add the support to check Java's @Override annotation (OverrideJavaChecker)

[HyukjinKwon]

I see Java's @Deprecated can be checked with DeprecatedJavaChecker but it might be nicer if we have a rule for preventing @Override as well.

[matthewfarwell]

Good idea. Do you want to do the PR?

[HyukjinKwon]

I am afraid I am not used to the code base here. Is it okay to give a shot though referring DeprecatedJavaChecker?

[canoztokmak]

@HyukjinKwon yes, I guess it will be quite similar to DeprecatedJavaChecker implementation.

[canoztokmak]

submitted #245 for this issue.

[HyukjinKwon]

Thank you.

[matthewfarwell]

#245 has been merged. Closing.

[HyukjinKwon]

Thanks for dealing with this @canoztokmak and @matthewfarwell. I am eager to try this in a new release!