feat: added flow_store & flow_queue feature

Author: raphael-goetz

code0-flow/src/lib.rs

@@ -1,14 +1,5 @@
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
-}
+#[cfg(feature = "flow_store")]
+pub mod flow_store;
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
-}
+#[cfg(feature = "flow_queue")]
+pub mod flow_queue;