feat(cli): enable sub-process to run in detached mode

[notfilippo]

The PR is to enable processes started via Deno.run() to run in detached mode.

This is a continuation of #5836,
Discussion can be found in #5501

TODO:

• Typing checks to ensure that piped is not passed to a detached process
• Check windows output from the CI and figure out how to test it

[CLAassistant]

All committers have signed the CLA.

[notfilippo]

Should I introduce this as an unstable feature?

[notfilippo]

There are still some issues with windows not properly detaching... it seems like process spawner hangs until child exits even if detached flags are provided.

I based my windows code on this part of the rust std:
https://github.com/rust-lang/rust/blob/6cae28165f0450fd3f100374b26841e458b8cfef/library/std/src/sys/windows/process.rs#L171-L174

[lucacasonato]

@piscisaureus Could you take a look? This doesn't seem to work:
https://github.com/denoland/deno/pull/7481/files#diff-451155f201c7ace608f64a3fc506be9aR108-R116

[bartlomieju]

@Qu4k please rebase the PR and let's try to get it landed for 1.6.0

[notfilippo]

@Qu4k please rebase the PR and let's try to get it landed for 1.6.0

I can but this still doesn't work in windows...

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[lirannl]

Has this been abandoned? I don't really use Windows so I can't help, but I feel like it's pretty important to be able to spawn detached child processes.

[notfilippo]

Has this been abandoned? I don't really use Windows so I can't help, but I feel like it's pretty important to be able to spawn detached child processes.

Well it's not abandoned but i don't have any way to test on windows so i'm blocked

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs. Thank you for your contributions.

[bartlomieju]

@filipporeds thank you for the PR, but I'm going to close it without a merge. Currently it's most likely that we'll adjust subprocess API as described in #9435 and ability to detach processes will be included in the rewrite. Thanks again!