dx: add watch task to expose all compile errors to vscode, including not open files.

[patroza]

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[fubhy]

I removed all our previous vscode tasks a while ago because they were unmaintained and completely broken. Which meant to me that noone was using them.

I don't mind re-adding some tasks for things like this. But the risk of these ending up in a broken state with noone noticing it for months is there.

[patroza]

@fubhy I can imagine. This is a very simple and straightforward task however, and the first thing I do when opening the repo is hit cmd+shift+b :)