DAST Python starts the ZAP server

What does this MR do?

Adds a class that is able to start the ZAP Server. This class is not used yet, it is anticipated that it will be used once ZAP Python scripts are moved to the DAST repository and the migration effort continues.

What are the relevant issue numbers?

This issue in part resolves gitlab-org/gitlab#218814 (closed).

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Job definition example
  • Vendored CI Templates (also in CE)
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer