buffer: implement blob.textStream() #8240

Job	Run time
Build slim tarball	1m 5s
aarch64-linux: Cache V8 build	23s
x86_64-darwin: with shared libraries	38m 59s
x86_64-linux: with shared libraries	26m 40s
aarch64-darwin: with shared libraries	24m 54s
aarch64-linux: with shared openssl-1.1.1w	23m 38s
aarch64-linux: with shared openssl-3.6.2	23m 56s
aarch64-linux: with shared openssl-4.0.0	24m 10s
aarch64-linux: with shared openssl-3.5.6	23m 42s
aarch64-linux: with shared openssl-3.0.20	24m 5s
aarch64-linux: with shared boringssl-0.20260526.0	23m 30s
	3h 55m 2s

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