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1b2f50bea1
## What changed? Add client-side of dynamic partition scaling: `partitionCache`, `PartitionCounts`, `StalePartitionCounts` error, `invokeWithPartitionCounts`. The intended behavior is: For partition-aware calls (add+poll tasks), the client caches the partition count for active task queues, and uses those partition counts for load balancing (no change to load balancing algorithm yet). The client sends its cached partition counts to the server in a grpc header, and receives updated partition counts with the response in a grpc trailer. If the updated counts are different, it updates its cache it for subsequent requests. If the server indicates that the client's view of partition count is stale, it returns a special `StalePartitionCounts` error and then client makes one immediate retry with the newly received counts. With just this PR by itself, the server will never send counts, the cache will always be empty, and the client will always fall back to dynamic config for partition counts, so there's no change in behavior yet. ## Why? Implement half of dynamic partition scaling. ## 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) – tests are in future PRs