*: fix drainer can't send request correctly to pump when set compressor=gzip (#1186)

[ti-chi-bot]

This is an automated cherry-pick of #1186

What problem does this PR solve?

Issue Number: close #1152

What is changed and how it works?

See #1152 (comment), add 4MB buffer for max grpc message size.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  Test playground with compressor, works correctly.

Related changes

• Need to cherry-pick to the release branch

Release note

• fix drainer can't send request correctly to pump when set compressor=gzip

[ti-chi-bot]

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[lichunzhu]

/merge

[ti-chi-bot]

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

Commit hash: 0f34746

[lichunzhu]

/run-all-tests