stream: make readable & writable computed
This makes readable and writable automatically computed based on the stream state.
Effectivly deprecating/discouraging manual management of this.
Makes the properties more consistent and easier to reason about.
Refs: https://github.com/nodejs/node/issues/29377
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines