Adds context embedding to pkg/count, and embeds
the backup, restore, and export operation ctx with the operations count.bus. The bus is extracted from the ctx in api middleware to track throttling response counts, as well as token consumption counts. Counts are globally tracked, not on a per-time or per resource basis.
---
#### Does this PR need a docs update or release note?
- [x] ⛔ No
#### Type of change
- [x] 🌻 Feature
#### Test Plan
- [x] ⚡ Unit test
- [x] 💚 E2E
6bc40ea2aa