[issue 840][client] batchReceive support for consumer

[labuladong]

Note: this pr is still a draft and waiting for #848 to be merged.

Master Issue: #840

Motivation

Add batchReceive method for consumers.

Verifying this change

• Make sure that the change passes the CI checks.

(Please pick either of the following options)

This change is a trivial rework / code cleanup without any test coverage.

(or)

This change is already covered by existing tests, such as (please describe tests).

(or)

This change added tests and can be verified as follows:

(example:)

• Added integration tests for end-to-end deployment with large payloads (10MB)
• Extended integration test for recovery after broker failure

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): (yes / no)
• The public API: (yes / no)
• The schema: (yes / no / don't know)
• The default values of configurations: (yes / no)
• The wire protocol: (yes / no)

Documentation

• Does this pull request introduces a new feature? yes
• If yes, how is the feature documented? not documented
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[Gleiphir2769]

Hi @labuladong , Does the batch index level ack will be supported in this PR?

Or this PR is only used to support batch receive and the batch index ack is in another plan?

[labuladong]

Hi @Gleiphir2769, for now, this pr is just for the batch receive policy. No implementation of batch index level ack.

[frodopwns]

How is this working progressing? I too have need of batch receive functionality in Go.