Issue/3 Apt package

Description

Create apt::Package based on std::Package + rework handler to use that one

Closes #2 (closed)

Reviewers list

• @bart

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)
• Sufficient test cases (reproduces the bug/tests the requested feature)
• Correct, in line with design
• Type annotations
• Issue is in the review column
• MR is assigned to first reviewer