[feature request] [vs-code] Use new `files.readonlyInclude` for external crates

Go to Definition opens the source files for the standard library and external crates, where a missclick could change them.
The new setting files.readonlyInclude with

"files.readonlyInclude": {
    "C:/Users/anton/.rustup/**/*": true,
    "C:/Users/anton/.cargo/**/*": true,
}

where the correct locations are automatic generated would prevent mistakes.

I would appreciate if the extension could change the user setting automatic. Maybe a small question, when the extension is activated with yes, no and never.

No files or tests are named. Start by locating the Go to Definition handling for standard-library and external-crate sources, then inspect the extension activation and settings paths; done means the relevant generated locations are covered by files.readonlyInclude with a clear yes/no/never choice.