Move util files into the classpath, as a package.

Summary:
- Make them into a Java package.
- Move them into the CP.
- Extract the sine and cosine table out to a common place.

Test Plan: Untested, but it compiles.

Reviewers: jcarter

Reviewed By: jcarter

Differential Revision: https://phabricator.edgesysdesign.com/D114