Continuous integration

Add `JsStringBuilder` to build `JsString` #11898

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Run time

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Job	Run time
MSRV	1m 57s
Formatting	8s
Test (macos-latest)	3m 10s
Fuzzing	1m 17s
Build & run examples	5m 44s
Test (windows-latest)	9m 20s
Lint	4m 26s
Documentation	1m 20s
Coverage	12m 31s
	39m 53s