scheduler: use asynclog to reduce klog performance overhead

[eahydra]

Ⅰ. Describe what this PR does

By default, klog outputs logs synchronously to stderr, which will affect performance when there are too many logs.
Therefore, we can reduce the delay caused by syscall and IO by outputting logs asynchronously, thus improving performance.

When enable --async-log, also need to enable -logtostderr and disable -alsologtostderr. And also can set --async-log-queue-length to fine-tune performance.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8c19de1) 65.91% compared to head (eafe686) 65.95%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1694      +/-   ##
==========================================
+ Coverage   65.91%   65.95%   +0.03%     
==========================================
  Files         385      385              
  Lines       41639    41639              
==========================================
+ Hits        27447    27461      +14     
+ Misses      12155    12143      -12     
+ Partials     2037     2035       -2     

Flag	Coverage Δ
unittests	65.95% <ø> (+0.03%)	⬆️

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see 3 files with indirect coverage changes

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[hormes]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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