dead_code: config/src/kdl.rs -> NodeExt::get_string(...) never used

[peter-lyons-kehl]

Thank you for the scheduler.

   Compiling system76-scheduler-config v2.0.2 (/var/tmp/pamac-build-pkehl/system76-scheduler-git/src/system76-scheduler/config)
warning: method `get_string` is never used
  --> config/src/kdl.rs:21:8
   |
15 | pub trait NodeExt {
   |           ------- method in this trait
...
21 |     fn get_string(&self, index: impl Into<NodeKey>) -> Option<&str>;
   |        ^^^^^^^^^^
   |
   = note: `#[warn(dead_code)]` on by default

warning: `system76-scheduler-config` (lib) generated 1 warning
   Compiling tracing-subscriber v0.3.16
...

grep -r get_string config data execsnoop/ daemon/ debian/ pipewire/
config/src/kdl.rs:    fn get_string(&self, index: impl Into<NodeKey>) -> Option<&str>;
config/src/kdl.rs:    fn get_string(&self, index: impl Into<NodeKey>) -> Option<&str> {

As per config/src/lib.rs, kdl module is crate-public only: pub(crate) mod kdl;.

Should it be

• removed, or
• marked with #[allow(dead_code)]?

I'm willing to create a pull request.