[STAL-2746] Git hooks first implementation

[juli1]

What problem are you trying to solve?

We want to deliver the first iteration of Git hooks. It ensures that no violation nor secret is being committed.

What is your solution?

• Integrate static-analysis in the git hooks
• Add an option --confirmation so that user can override
• Add nice printing functions (more user-friendly)
• Add documentation with examples

Testing

Added more integration tests for all different cases. Also added documentation on how to use it in a real-world repo.

Example of invocation