stream: move legacy to lib/internal dir
Checklist
-
make -j4 test
(UNIX), orvcbuild test nosign
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
stream
Description of change
This won't fix anything problem or adds any new feature, it just makes the "lib/stream.js" clear to read in my opinion, I'm unsure if this makes any sense, if the feedback from anyone in @nodejs/collaborators is negative, feel free to close :-)