WIP: Disable binary downloads

[mikayla-maki]

fixes #12589 #12354

follow up to #12703

TODO:

• Implement a setting for globally enabling / disabling binary downloads
  • Node
  • Supermaven & Copilot
  • Built in and extension LSP binaries
• Report appropriate errors to the user when downloads are blocked this way
• Add this setting to the welcome page, so users have a chance to disable it before continuing.

Release Notes:

• TODO

[darix]

please document how distribution packagers can tell zed where to find the distro versions of the binaries/extensions that you want to use. so we can cover the needed dependencies with packaging.

[WeetHet]

I think it would be actually nicer to show a notification when trying to download a binary, so the user can agree or disagree in that moment

[imbev]

please document how distribution packagers can tell zed where to find the distro versions of the binaries/extensions that you want to use. so we can cover the needed dependencies with packaging.

The Flatpak package would be a good place to demonstrate this

[mikayla-maki]

I think it would be actually nicer to show a notification when trying to download a binary, so the user can agree or disagree in that moment

This will be rolled into an additional and separate change, when we finish our extension system.

[Xinayder]

Is there any particular reason why this setting is opt-out and not opt-in? It's interesting to see it being handled this way. Plus, looking at the current state, it seems like the user won't be able to choose whether to download missing binary packages or not, i.e., if you opt-out for automatic binary downloads you'll have to install them manually.

Wouldn't a system like VS Code's be better in this case? Either block all downloads, or allow the user to choose if they want to download required binary packages for extensions when they first open a project (and have a third option to just install them automatically)?

[mikayla-maki]

For future reference, this PR has not been abandoned. I got Covid shortly after the Linux launch, and haven't been able to write code for a while. This should be finished in the next few weeks, as I recover. We'll be incorporating the feedback here and in other places when we restart this work.