Detect Deno projects

[alienvspredator]

At the moment, enabling Deno support requires manual configuration in project's settings or in the global settings.
https://zed.dev/docs/languages/deno

This process can be tedious, especially when switching between projects or onboarding new developers (#24064).

It would be great if we could detect Deno projects. This could be done by detecting deno.json and/or deno.lock files in the workspace.

When we detect those files, we could show an interactive notification which contains an action button for updating .zed/settings.json file.

[landsman]

Exactly. Detect the configuration file -> suggest to install the extension -> show me modal window, that project have to be configured manually at least.