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.

Fixes: https://github.com/nodejs/node/issues/29377

PR-URL: https://github.com/nodejs/node/pull/31197
Refs: https://github.com/nodejs/node/issues/29377


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>