Searching for new bases is mostly kopia-specific but is going to require the store interface. With the way packages and interfaces are currently laid out it makes it impossible to easily get the interface added to the inject package without a cycle.
This moves functions that the kopia package provides into a subpackage of the kopia package that other things can then import
This change only moves code. No logic is updated
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#### Does this PR need a docs update or release note?
- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No
#### Type of change
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [x] 🧹 Tech Debt/Cleanup
#### Issue(s)
* #3202
#### Test Plan
- [ ] 💪 Manual
- [x] ⚡ Unit test
- [ ] 💚 E2E
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