benchmark: add streaming TextDecoder benchmark #2942

Job	Run time
Build slim tarball	1m 28s
aarch64-linux: with shared libraries	43m 47s
x86_64-darwin: with shared libraries	2h 46m 42s
x86_64-linux: with shared libraries	50m 2s
aarch64-darwin: with shared libraries	1h 30m 2s
	5h 52m 1s

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