Encapsulate stream requests more:
- `WriteWrap` and `ShutdownWrap` classes are now tailored to the
streams on which they are used. In particular, for most streams
these are now plain `AsyncWrap`s and do not carry the overhead
of unused libuv request data.
- Provide generic `Write()` and `Shutdown()` methods that wrap
around the actual implementations, and make *usage* of streams
easier, rather than implementing; for example, wrap objects
don’t need to be provided by callers anymore.
- Use `EmitAfterWrite()` and `EmitAfterShutdown()` handlers to
call the corresponding JS handlers, rather than always trying
to call them. This makes usage of streams by other C++ code
easier and leaner.
Also fix up some tests that were previously not actually testing
asynchronicity when the comments indicated that they would.
PR-URL: https://github.com/nodejs/node/pull/18676
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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