Continuous integration

Add string builder to build `JsString` #12314

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Run time

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Job	Run time
MSRV	2m 11s
Coverage	7m 57s
Fuzzing	1m 15s
Build & run examples	5m 22s
Lint	4m 47s
Documentation	31s
Formatting	10s
Test (macos-latest)	2m 56s
Test (windows-latest)	5m 21s
	30m 30s