*: log each com_stmt_fetch separately (#11987)

[sre-bot]

cherry-pick #11987 to release-3.0

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What problem does this PR solve?

to slow log:

In the current master code, slow log will be wrong value(last fetch time(or new start execute time) - last cmd time)
In 2.1 code, slow log will be incompatible value(last fetch time(or new start execute time) - first com_stmt_execute time)
but mysql record com_stmt_exec and com_stmt_fetch for each request.

this pr will change the behavior as MySQL does, although TiDB and MySQL use very different way to handle cursor:

• MySQL execute sql and save the result in temp table(memory or myisam), then fetch the tmp table
• TiDB cache the executor-tree and execute when fetch command came and cache partial result in memory(now TiDB-server node is stateless and doesn't write any data in local disk)

so, you may see mysql stmt_execute is slow but fetch super fast, and TiDB both execute and fetch is slow in log.

What is changed and how it works?

• add LogParitialSlow to recordset
• Fix stmt_reset should clean up opened cursor in stmt(but pay attention both libmysql c API and jdbc, close ResultSet shouldn't send stmt_reset in current client impl, but mysql server will handle stmt_reset like this)
• log InPreapre and HasMoreResult in slow log too(help find question)
• log Parse_time and Compile_time in slow log(it seems miss those two fields)

Check List

Tests

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

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation
• Need to update the tidb-ansible repository

Release note

• Write release note for bug-fix or new feature.

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This change is 

[sre-bot]

/run-all-tests

[lysu]

/run-unit-test

[jackysp]

LGTM

[coocood]

LGTM

[sre-bot]

/run-all-tests

[lysu]

/run-cherry-picker

[lysu]

/run-cherry-picker

[sre-bot]

cherry pick to release-3.1 failed

[lysu]

/run-cherry-picker

[lysu]

/run-cherry-picker

[lysu]

/run-cherry-picker

[lysu]

/run-cherry-picker

[lysu]

/run-cherry-picker

[you06]

/run-cherry-picker

[sre-bot]

cherry pick to release-3.1 in PR #13302