Add new languages to SAST

Description

SAST already supports the following languages:

• Python (bandit)
• Ruby on Rails (brakeman)
• Java (find-sec-bugs)

This is very good, but we can increase the support even more, adding other common languages.

Proposal

Find opensource tools and include them in the SAST app to provide support for the following languages.

10.7

• SAST for Go: https://gitlab.com/gitlab-org/gitlab-ee/issues/5237
• SAST for C/C++: https://gitlab.com/gitlab-org/gitlab-ee/issues/4124

10.8

• SAST for Java Gradle: https://gitlab.com/gitlab-org/gitlab-ee/issues/5230
• SAST for PHP: https://gitlab.com/gitlab-org/gitlab-ee/issues/5378

11.0

• SAST for Scala: https://gitlab.com/gitlab-org/gitlab-ee/issues/5250
• SAST for .NET: https://gitlab.com/gitlab-org/gitlab-ee/issues/4824