feat(metrics): add support for gauge metrics and include IMC metrics (#4939)

Co-authored-by: hyperswitch-bot[bot] <148525504+hyperswitch-bot[bot]@users.noreply.github.com>

crates/storage_impl/src/redis/cache.rs

@@ -207,6 +207,16 @@ impl Cache {
     pub async fn remove(&self, key: CacheKey) {
         self.inner.invalidate::<String>(&key.into()).await;
     }
+
+    /// Performs any pending maintenance operations needed by the cache.
+    pub async fn run_pending_tasks(&self) {
+        self.inner.run_pending_tasks().await;
+    }
+
+    /// Returns an approximate number of entries in this cache.
+    pub fn get_entry_count(&self) -> u64 {
+        self.inner.entry_count()
+    }
 }
 
 #[instrument(skip_all)]