Add any_values and extra_values snippets for rust

[teh-cmc]

With the new SerializedComponentBatch acting as the core logging type in Rust, we can now emulate Python's AnyValues with little efforts.

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let rec = rerun::RecordingStreamBuilder::new("rerun_example_any_values").spawn()?;

    let confidences = rerun::SerializedComponentBatch::new(
        Arc::new(arrow::array::Float64Array::from(vec![1.2, 3.4, 5.6])),
        rerun::ComponentDescriptor::new("confidence"),
    );

    let description = rerun::SerializedComponentBatch::new(
        Arc::new(arrow::array::StringArray::from(vec!["Bla bla bla…"])),
        rerun::ComponentDescriptor::new("description"),
    );

    rec.log("any_values", &[confidences, description])?;

    Ok(())
}

[github-actions]

Web viewer built successfully. If applicable, you should also test it:

• I have tested the web viewer

Result	Commit	Link	Manifest
✅	d7bd306	https://rerun.io/viewer/pr/8718	+nightly +main

^{Note: This comment is updated whenever you push a commit.}