sink: fix kafka max message size inaccurate issue. (#3002)

[ti-chi-bot]

This is an automated cherry-pick of #3002

What problem does this PR solve?

try to close #2962

What is changed and how it works?

• When calculating the length of encoded MQMessage, also consider the maximumRecordOverhead, which was introduced by the sarama client.
• Ignoring max-message-size at the producer level, default to 512m. max-message-size only works for the encoder.
• Change log level to Debug when AppendRowChangedEvent in json encoder.

Check List

Tests

• Unit test
• Manual test (add detailed scripts or steps below)

Code changes
Side effects

Related changes

Release note

fix kafka sink can not send message due to constraint by `max-message-size` option.

[ti-chi-bot]

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[3AceShowHand]

/run-all-tests

[3AceShowHand]

/run-kafka-tests
/run-unit-tests

[amyangfei]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: b88d5d8