housekeeping(server): clean too-broad visibility markers and organize imports

server/crates/arbiter-server/src/grpc/request_tracker.rs

@@ -1,12 +1,12 @@
 use tonic::Status;
 
 #[derive(Default)]
-pub struct RequestTracker {
+pub(super) struct RequestTracker {
     next_request_id: i32,
 }
 
 impl RequestTracker {
-    pub fn request(&mut self, id: i32) -> Result<i32, Status> {
+    pub(super) fn request(&mut self, id: i32) -> Result<i32, Status> {
         if id < self.next_request_id {
             return Err(Status::invalid_argument("Duplicate request id"));
         }
@@ -20,7 +20,7 @@ impl RequestTracker {
 
     // This is used to set the response id for auth responses, which need to match the request id of the auth challenge request.
     // -1 offset is needed because request() increments the next_request_id after returning the current request id.
-    pub fn current_request_id(&self) -> i32 {
+    pub(super) fn current_request_id(&self) -> i32 {
         self.next_request_id - 1
     }
 }