back feat: Support batch receive for consumer.

[shibd]

Master Issue: (todo 274)

Motivation

(todo 274) Support batch receive for the consumer.

Modifications

• Add batch receive policy config on the consumer.
• Add batch receive interface on the consumer.
• Refactor consumer config set and verify logic.
  • Since config set logic with verify logic for the consumer is separate, it will be more complicated to read the code and subsequent extensions.

Verifying this change

• Add batch receive unit test on Consumer.
• Add more config verify unit test on Consumer.

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