Incorrect Value for BufferedFetchRecords When Pausing/Resuming

[mehranmeidani]

When pausing a partition, and then resume it, the client will consume all messages, but the value of buffered fetches remains > 0.

How to reproduce:

1. Start a consumer
2. Pause a partition
3. Resume a partition

I believe kgo.takeNBuffered does not decrease the number of buffered messages for the paused partition/topic despite the fact that it calls allowUsable on the curosr and skip the message.

I have a sample code that shows a client that consumes all messages eventually, but the BufferedFetchRecords still shows some buffered messages in the client.