Add Batch Bytes to Kafka

[itsarijitray]

JIRA: https://twilio-engineering.atlassian.net/browse/STRATCONN-6211

Testing

Include any additional information about the testing you have completed to
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any of the tasks you completed below during your testing.

• Added unit tests for new functionality
• Tested end-to-end using the local server
• [If destination is already live] Tested for backward compatibility of destination. Note: New required fields are a breaking change.
• [Segmenters] Tested in the staging environment
• [Segmenters] [If applicable for this change] Tested for regression with Hadron.

[codecov]

Codecov Report

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Additional details and impacted files

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  Hits            ?    17693           
  Misses          ?     3637           
  Partials        ?      777           

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[joe-ayoub-segment]

Suggested change

	'The number of bytes to batch together. Default is 1MB. Maximum value varies by kafka cluster. The less you batch, the more requests will be sent to your Kafka cluster.',
	"Specifies the maximum number of bytes to batch before sending. The default is 1 MB, though the maximum allowed depends on the Kafka cluster. Smaller batch sizes result in more frequent requests to the cluster.",