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✨ Add alpha update command for 3-way project upgrade

This commit introduces the `kubebuilder alpha update` command, which enables users to upgrade their Kubebuilder projects via a 3-way Git merge strategy.

The update flow:
- Creates an 'ancestor' branch based on the original scaffold version
- Extracts the user's current project state into a 'current' branch
- Generates a fresh scaffold using the target version in the 'upgrade' branch
- Merges changes into a 'merge' branch, preserving user code and applying updates

This mechanism allows users to safely adopt new scaffolding and maintain their custom logic with minimal manual effort.