Draft: handle gradle implementation directive

What does this MR do?

This MR allows for License Finder to detect licenses that belong to dependencies declared by the implementation directive. It does so by using a gradle.init script to set dependencyConfiguration = runtimeClasspath.

What are the relevant issue numbers?

See License Scanning doesn't handle gradle dependen... (gitlab-org/gitlab#341222 - closed) for more information.

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
  • CI Templates (to be removed)
  • Vendored CI Templates (also in CE)
  • Ensure that all of the ENV vars supported are propagated to Docker containers upon docker run in job definitions
• Conforms to the code review guidelines
• Security reports checked/validated by reviewer