Reformat imports to a consistent style for imports

rustfmt.toml configuration:
  imports_granularity = "One"
  group_imports = "One"

metrics/src/lib.rs

@@ -3,7 +3,6 @@ pub mod counter;
 pub mod datapoint;
 mod metrics;
 pub use crate::metrics::{flush, query, set_host_id, set_panic_hook, submit};
-
 use std::sync::Arc;
 
 /// A helper that sends the count of created tokens as a datapoint.