Fixes#118
- Remove MANUAL_IMMEDIATE_SYNC - sync/async is controlled by the `syncCommits` property
- For MANUAL, wake the consumer thread at the end of the batch
- For MANUAL_IMMEDIATE, the consumer thread is woken directly from the Acknowledgement
Polishing
* Some simple code reformatting for `KafkaMessageListenerContainer`
* Move the `CountDownLatch` logic in the `KafkaMessageListenerContainerTests#testSlowConsumerCommitsAreProcessed()`
into the mock for `Consumer.commitSync()` since the count logic in the listener immediately after `ack.acknowledge()` doesn't guaranty that
`Consumer.commitSync()`will be called. That is because listener lives in one Thread, but `processCommits()` is done from a different `ListenerConsumer` Thread
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