Fixes#16899.
Fixes https://github.com/denoland/deno/issues/23524.
Fixes https://github.com/denoland/deno/issues/23938.
Fixes https://github.com/denoland/deno/issues/27869.
Unblocks #5501.
This PR adds support for additional stdio pipes to windows, as well as
the detached option in `node:child_process`. I also ported over the
`kill` implementation for windows, which means we now can support
`kill(0)` as well as some other signals.
This means that playwright will now work on windows.
Now that we have a way to support detached processes on all platforms,
we can also easily add a `detached` option to `Deno.Command`, similar to
`child_process.spawn`.
---
The reason for moving away from `std::process::Command` is that the
standard library doesn't expose what we need to control the file
descriptor table of child processes on windows. The implementation here
is based off of parts of `std` and parts of `libuv`, and allows us to
support passing extra pipes in addition to detached processes on
windows.
