refactor: Move `CommandConfigs` and `LifecycleHooks` to their own directories

[spydon]

Description

This moves the CommandConfigs and LifecycleHooks to their own directories to make it easier to extend the functionality, since the workspace_configs.dart was getting very long.

This was done in preparation for adding publish hooks.

Type of Change

• [ ] ✨ feat -- New feature (non-breaking change which adds functionality)
• [ ] 🛠️ fix -- Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ ! -- Breaking change (fix or feature that would cause existing functionality to change)
• [x] 🧹 refactor -- Code refactor
• [ ] ✅ ci -- Build configuration change
• [ ] 📝 docs -- Documentation
• [ ] 🗑️ chore -- Chore