Keepers f4847404c4
add per-container item collision enumeration (#3629)
populates the item collision cache generators for all exchange data types.  Next we'll use these to compare the items being restored for collision before making post requests, by populating this cache at the top of each collection restore process.

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#### Does this PR need a docs update or release note?

- [x]  No

#### Type of change

- [x] 🌻 Feature

#### Issue(s)

* #3562

#### Test Plan

- [x]  Unit test
- [x] 💚 E2E
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