logutil, *: implement log desensitization (#3011)

[ti-srebot]

cherry-pick #3011 to release-4.0

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What problem does this PR solve?

close #2852

Implement log desensitization to omit the region key information from the log.

What is changed and how it works?

Check List

Tests

• Unit test

Code changes

• Has configuration change

Related changes

• PR to update pingcap/docs/pingcap/docs-cn:

Release note

• Support configuration enable-redact-log to enable log desensitization or not.

[ti-srebot]

@Yisaer you're already a collaborator in bot's repo.

[HunDunDM]

please fix the conflict

[nolouch]

cc @Yisaer

[codecov]

Codecov Report

Merging #3266 (c5889a9) into release-4.0 (c3874d9) will decrease coverage by 0.41%.
The diff coverage is 64.44%.

@@               Coverage Diff               @@
##           release-4.0    #3266      +/-   ##
===============================================
- Coverage        75.20%   74.79%   -0.42%     
===============================================
  Files              209      209              
  Lines            19599    19628      +29     
===============================================
- Hits             14740    14681      -59     
- Misses            3534     3628      +94     
+ Partials          1325     1319       -6     

Flag	Coverage Δ
unittests	74.79% <64.44%> (-0.42%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/replication/replication_mode.go	69.66% <33.33%> (-0.87%)	⬇️
server/core/region_tree.go	91.34% <40.00%> (-0.89%)	⬇️
server/cluster/cluster.go	79.95% <50.00%> (-2.50%)	⬇️
server/cluster/cluster_worker.go	69.36% <50.00%> (-2.60%)	⬇️
pkg/logutil/log.go	83.96% <81.25%> (-0.38%)	⬇️
server/config/config.go	74.54% <100.00%> (+0.17%)	⬆️
server/schedule/checker/merge_checker.go	70.00% <100.00%> (+0.76%)	⬆️
server/statistics/store_collection.go	58.53% <0.00%> (-34.96%)	⬇️
server/region_syncer/server.go	79.38% <0.00%> (-9.93%)	⬇️
server/id/id.go	76.19% <0.00%> (-4.77%)	⬇️
... and 10 more

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[Yisaer]

/merge

[ti-chi-bot]

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

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/ti-community-prow repository.

[ti-chi-bot]

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

Commit hash: 1204d76

[ti-chi-bot]

@ti-srebot: Your PR has out-of-dated and I have automatically updated it for you.
At the same time I will also trigger all tests for you:

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/ti-community-prow repository.