Simple fix to add radius to SuperClusterViewportOptions.

[taserian]

Meant to resolve issues #724, #803

Thank you for opening a Pull Request!

---

Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• [ X ] Make sure to open a GitHub issue as a bug/feature request before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• [ X ] Ensure the tests and linter pass
• [ X ] Code coverage does not decrease (if any source code was changed)
• [ X ] Appropriate docs were updated (if necessary)

Fixes #724 , #803 🦕

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.