flake-edit

The goal of the flake-edit cli and library is to provide a safe, correct and seamless
way to interact with and manage flake inputs.

This is an early release, but basic features are implemented.

Features:

- Add new flake inputs.
- Remove flake inputs.
- Pin flake inputs to current revision.
- Pin flake inputs to specific revision.
- Update flake inputs to their latest semver compatible release (not many forges supported yet).
- Shell completions.

Please review and provide feedback.