buffer: implement blob.textStream() #8238

Job	Run time
Build slim tarball	1m 8s
aarch64-linux: Cache V8 build	21s
aarch64-darwin: with shared libraries	3m 55s
x86_64-darwin: with shared libraries	3m 52s
x86_64-linux: with shared libraries	3m 47s
aarch64-linux: with shared boringssl-0.20260526.0	3m 17s
aarch64-linux: with shared openssl-4.0.0	3m 17s
aarch64-linux: with shared openssl-3.0.20	3m 17s
aarch64-linux: with shared openssl-3.6.2	3m 18s
aarch64-linux: with shared openssl-3.5.6	3m 18s
aarch64-linux: with shared openssl-1.1.1w	3m 17s
	32m 47s

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