feat: Adjust and implement new tests for the lock-free ringbuffer imp…

…lementation.

* Adjusted current tests for the lock-free behavior.
* Added tests for the non-blocking implementation.
* Implemented new tests for scenarios, where one thread always runs slower than the other.

ouster-ros/src/thread_safe_ring_buffer.h

@@ -135,11 +135,19 @@ class ThreadSafeRingBuffer {
   protected:
     /**
      * Resets the write_idx to an initial value.
-     * @remarks Should be mostly used by tests to allow reading of the final
-     * item left in the buffer.
+     * @remarks
+     *  Should be mostly used by tests to allow reading of the final item left
+     *  in the buffer or restarting the test scenario.
      */
     void reset_write_idx() { write_idx = SIZE_MAX; }
 
+    /**
+     * Resets the read_idx to an initial value.
+     * @remarks
+     *  Should be mostly used by tests to allow restarting the test scenario.
+     */
+    void reset_read_idx() { read_idx = SIZE_MAX; }
+
    private:
      /**
       * Performs the actual sequence of operations for writing.