Add mutex to protect exchange receiver's async client (#5008)

[ti-chi-bot]

This is an automated cherry-pick of #5008

What problem does this PR solve?

Issue Number: close #4977

Problem Summary:

What is changed and how it works?

For ExchangeReceiver's async client mode, AsyncRequestHandler instance is used to handle async client request and rsp. And it is shared between grpc and reactor thread. However, when handler is creating, there is a little chance that grpc thread get the instance before the creation is completed. So there is chance that #4977 would happen.
Now this is noticed only when makeAsyncReader failed and retried.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• windtalker
• yibin87

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[windtalker]

LGTM

[yibin87]

LGTM

[windtalker]

/merge

[ti-chi-bot]

@windtalker: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: 1791de8

[windtalker]

/merge

[ti-chi-bot]

@windtalker: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and if the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

If you have any questions about the PR merge process, please refer to pr process.

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[sre-bot]

Coverage for changed files

Filename                            Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Flash/Mpp/ExchangeReceiver.cpp          320               320     0.00%          32                32     0.00%         486               486     0.00%         192               192     0.00%
Functions/FunctionsDateTime.cpp          68                31    54.41%          14                 3    78.57%         197                58    70.56%          48                25    47.92%
Functions/FunctionsDateTime.h          1061               628    40.81%         328               211    35.67%        2005              1196    40.35%         516               327    36.63%
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                  1449               979    32.44%         374               246    34.22%        2688              1740    35.27%         756               544    28.04%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
18231      9783             46.34%    204181  97999        52.00%

full coverage report (for internal network access only)