Move filesystem related resources

Description

Move File, ConfigFile, Symlink and Directory resources from std module.

I fixed a few mypy errors, not sure how to address remaining ones.

Closes #1 (closed)

Reviewers list

• reviewer 1

Self Check:

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• 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
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