## What changed?
- Matching server propagates partition counts in ephemeral data.
- Matching server validates partition counts sent by client, and rejects
if they are too far.
## Why?
Next part of dynamic partitioning.
## How did you test it?
- [ ] built
- [ ] run locally and tested manually
- [ ] covered by existing tests
- [x] added new unit test(s)
- [x] added new functional test(s) - covered by future integration tests
## Potential risks
No change in behavior at this point, partition scale info is always nil,
so nothing will be rejected. The server will start sending grpc trailers
though.
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