stream: add diagnostics for readable stream chunk additions #474

Job	Run time
Build slim tarball	1m 36s
aarch64-linux: with shared libraries	43m 5s
x86_64-linux: with shared libraries	47m 34s
x86_64-darwin: with shared libraries	51m 53s
aarch64-darwin: with shared libraries	39m 23s
	3h 3m 31s

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