[PATCH] Rust uses rustc instead of cargo (fix included!)

- VS Code Version: All
- OS Version: Windows 10 latest
- Code Runner Version: Latest

**Describe the bug**
When a rust project is created with cargo (which is most of them now days) it should be run via cargo, not rustc for proper dependency handling

**To Reproduce**
Steps to reproduce the behavior:

1. Attempt to run a rust cargo project

**Actual behavior**
rustc is used on the .rs file you are editing, which is likely to fail due to dependencies

**Expected behavior**
cargo build && cargo run

**Fix**
in settings.json for windows the correct test would be this: ```"rust": "if EXIST Cargo.toml ( cargo run ) ELSE ( rustc $fileName && $dir$fileNameWithoutExt )", ```

Which will check if Cargo.toml is present and if it is use that, elsewhere it will use rustc