## Description
Add a helper function that allows loading the root directory of a snapshot given the snapshot manifest. This will allow future code for merging directory hierarchies to be tested without having to involve an actual instance of kopia with some previously created snapshots.
## Type of change
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Test
- [ ] 💻 CI/Deployment
- [x] 🐹 Trivial/Minor
## Issue(s)
* #1740
## Test Plan
- [x] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E