feat: add tick interval to drainer (#517)

crates/router/src/configs/defaults.rs

@@ -116,6 +116,8 @@ impl Default for super::settings::DrainerSettings {
             stream_name: "DRAINER_STREAM".into(),
             num_partitions: 64,
             max_read_count: 100,
+            shutdown_interval: 1000,
+            loop_interval: 500,
         }
     }
 }

crates/router/src/configs/settings.rs

@@ -194,6 +194,8 @@ pub struct DrainerSettings {
     pub stream_name: String,
     pub num_partitions: u8,
     pub max_read_count: u64,
+    pub shutdown_interval: u32, // in milliseconds
+    pub loop_interval: u32,     // in milliseconds
 }
 
 #[derive(Debug, Clone, Default, Deserialize)]