pkg/log(dm):support reading fields from Ctx

[liuzix]

What problem does this PR solve?

Issue Number: close #5517

What is changed and how it works?

• Put zap fields to contexts with context.WithValue.
• Add WithCtx() method to log package, so that in each function call, the fields can be logged easily.
• Added relevant benchmarks.

Check List

Tests

• Unit test

Questions

Will it cause performance regression or break compatibility?

• No regression for current production code, because no existing execution path is affected.
• Benchmark results are as follows

goos: linux
goarch: amd64
pkg: github.com/pingcap/tiflow/dm/pkg/log
cpu: AMD Ryzen 9 5900X 12-Core Processor            
BenchmarkBaseline
BenchmarkBaseline-24    	 9693552	       124.1 ns/op
BenchmarkWithCtx
BenchmarkWithCtx-24     	 6640200	       181.1 ns/op
PASS

Process finished with the exit code 0

Using WithCtx increases time cost by 50% compared to traditional, but more complex methods. But given the baseline high performance of zap, it should be fine as long as no logging is used in CPU intensive operations.

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• amyangfei
• lance6716

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[amyangfei]

goos: linux
goarch: amd64
pkg: github.com/pingcap/tiflow/dm/pkg/log
cpu: AMD Ryzen 9 5900X 12-Core Processor            
BenchmarkBaseline
BenchmarkBaseline-24    	 9693552	       124.1 ns/op
BenchmarkWithCtx
BenchmarkWithCtx-24     	 6640200	       181.1 ns/op
PASS

Process finished with the exit code 0

Really fast CPU 🚀

[liuzix]

/merge

[ti-chi-bot]

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

Commit hash: 6900b47

[liuzix]

/run-dm-integration-test

[amyangfei]

/run-dm-integration-test