Start adding db download/upload, migrate graph to async/await

src/graph/pull_from_db.rs

@@ -0,0 +1,12 @@
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
+
+use super::sql::QueryExecutor;
+
+/**
+ * Pull data from a db using a db query into a csv file that can be used by another node
+ */
+fn pull_from_db(executor: &mut impl QueryExecutor, node: PullFromDBNode) {}
+
+#[derive(Serialize, Deserialize, Clone, JsonSchema)]
+pub struct PullFromDBNode {}