Issue/2 cleanup

Description

• Add tests for the existing parts
• Convert to module v2
• Add to CI
• setup Dependabot
• Use fs::File instead of std::File
• support both std::File and fs::File in the dependency handler

Closes #1 (closed)

Reviewers list

• @marcin.chron
• @bart

Developer Self Check:

Strike through any lines that are not applicable (~~line~~) then check the box

• Changelog entry and version bump inmanta module release --dev [--major|--minor|--patch] [--changelog-message "<your_changelog_message>"]
• Code is clear and sufficiently documented (classes, methods and function docs, document important assumptions, link to reference materials)
• Type annotations
• Issue is in the review column
• Code has been pre-reviewed by developer
• Sensitive elements have been highlighted with opened discussions
• This change will not break anything in production