[v9.x] net,src: refactor writeQueueSize tracking #18084
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/cc @apapirovski
Only merge conflict was a trivial one in
src/tty_wrap.cc
Currently, writeQueueSize is never used in C++ and barely used
within JS. Instead of constantly updating the value on the JS
object, create a getter that will retrieve the most up-to-date
value from C++.
For the vast majority of cases though, create a new prop on
Socket.prototype[kLastWriteQueueSize] using a Symbol. Use this
to track the current write size, entirely in JS land.
PR-URL: #17650