fix: use pub(crate) visibility for RecordingTimestampGenerator

The struct and its methods only need crate-level visibility since
the module itself is pub(crate). Using pub triggers the
unnameable_types lint.

Author: dkropachev

scylla-rust-wrapper/src/timestamp_generator.rs

@@ -17,21 +17,21 @@ pub enum CassTimestampGen {
 /// A wrapper around `MonotonicTimestampGenerator` that records all generated timestamps.
 /// This is used for integration testing purposes only.
 #[cfg(cpp_integration_testing)]
-pub struct RecordingTimestampGenerator {
+pub(crate) struct RecordingTimestampGenerator {
     inner: MonotonicTimestampGenerator,
     timestamps: std::sync::Mutex<Vec<i64>>,
 }
 
 #[cfg(cpp_integration_testing)]
 impl RecordingTimestampGenerator {
-    pub fn new() -> Self {
+    pub(crate) fn new() -> Self {
         Self {
             inner: MonotonicTimestampGenerator::new(),
             timestamps: std::sync::Mutex::new(Vec::new()),
         }
     }
 
-    pub fn contains(&self, timestamp: i64) -> bool {
+    pub(crate) fn contains(&self, timestamp: i64) -> bool {
         self.timestamps.lock().unwrap().contains(&timestamp)
     }
 }