Ack batch msgs

## Problem
Some messages send by Asyn. The messages in the batch may have many identical msgids.If we Ack a batch message, then all batches will be confirmed

## We expect
User can confirm a single message

No file, test, or entry point is named. Start by reproducing batch acknowledgement with multiple messages sharing a msgid, then trace the relevant acknowledgement path in the Go client and its Pulsar protocol behavior. Done means acknowledging one message no longer confirms other messages in the batch, with coverage for duplicate msgids.

Written by the indexing model from the issue text.