Generate better cargo check command for vscode

[tomasol]

I propose replacing the contents of .vscode/settings.json

{
    "rust-analyzer.check.overrideCommand": ["cargo", "component", "check", "--message-format=json"]
}

with

{
    "rust-analyzer.check.overrideCommand": [
        "cargo",
        "component",
        "check",
        "--workspace",
        "--all-targets",
        "--message-format=json"
    ],
}

This works well even if the project is not part of a workspace, and the parameters are mentioned in the User Maunal as the default:

By default, a cargo invocation will be constructed for the configured targets and features, with the following base command line:
cargo check --quiet --workspace --message-format=json --all-targets

The main benefit is that the current setting skips checking tests, benches etc.

[peterhuene]

@tomasol Thanks for the suggestion! That sounds like what we should be using then.

Would you be up for changing it to your suggestion in create_editor_settings_file from src/commands/new.rs (for both the VS Code and Emacs) and submit a PR?