[Issue 183] [Feat] Support cumulative acknowledge

[Gleiphir2769]

Master Issue: #183

Motivation

Cumulative acknowledgement is a useful feature. Users can use this feature to ack messages in the stream up to (and including) provided message.

Issue #183 shows more details.

Modifications

• Add two api AckCumulative and AckIDCumulative for Consumer.

// AckCumulative the reception of all the messages in the stream up to (and including)
// the provided message.
AckCumulative(msg Message) error

// AckIDCumulative the reception of all the messages in the stream up to (and including)
// the provided message, identified by its MessageID
AckIDCumulative(msgID MessageID) error

• Add the AckCumulative and AckIDCumulative implementation for consumer, multiTopicConsumer, regexConsumer and mockConsumer.

• Add the unit test TestConsumerNoBatchCumulativeAck TestConsumerBatchCumulativeAck TestCumulativeAckWithResponse for cumulative ack in consumer_test.go.

Verifying this change

• Make sure that the change passes the CI checks.

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• The public API: yes

[Gleiphir2769]

Hi, @RobertIndie @nodece, could you give a review when you are free? Thanks.