Adding Submarine to SonarCloud.io

[Wei-Chiu Chuang]

I requested Apache Infra to add the Submarine repo to SonarCloud.io so we
can start perform the static analysis checking for bugs and vulnerabilities.



   1. INFRA-22105 <https://issues.apache.org/jira/browse/INFRA-22105>
   2.


Let me know if you'd like to take on the responsibility of being an admin
on SonarCloud for this project.

Thanks,
Weichiu