Refactor CLI and add a new repod-file script

David Runge requested to merge refactor_cli into main

Refactor CLI related functionality into the repod.cli package. Expose a new repod-file script which adds functionality for package introspection and import, JSON schema export, management repository and repository sync databse import and export.

Fixes #65 (closed) Fixes #50 (closed)

Edited by David Runge

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