[feature request] C++ client support consumer batch receiving messages.

[shibd]

Search before asking

• I searched in the issues and found nothing similar.

Motivation

You can refer PIP-38.

Solution

No response

Alternatives

No response

Anything else?

Python Client has the same request: apache/pulsar-client-python#39, need to do this first.

Are you willing to submit a PR?

• I'm willing to submit a PR!

[github-actions]

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