Add initial `.readableWebStream()` implementation #537

Job	Run time
Prepare yarn cache	11s
Test on ubuntu-latest using Node.js LTS	20s
Test on Node.js v18.x	24s
typecheck	18s
Test on windows-latest using Node.js LTS	1m 23s
Test on Node.js v20.x	23s
Test on macOS-latest using Node.js LTS	22s
Release new version	0s
	3m 21s

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