[Issue 1262][consumer] stop timer when close timedAckGroupingTracker

[geniusjoe]

Contribution Checklist

Fixes #1262

Motivation

According to #1262

The ticker.Stop method is never called on the timedAckGroupingTracker member ticker, and so it is leaked.

Modifications

Call t.ticker.Stop() function when close timedAckGroupingTracker.

Verifying this change

• Make sure that the change passes the CI checks.

This change added tests and can be verified as follows:

• Added integration tests

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

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (no)
• The wire protocol: (no)

Documentation

• Does this pull request introduce a new feature? (no)