Add redis caching to getting user notifications and projects [MOD-540] (#723)

* Add redis caching to getting a user's project ids

* Run `cargo sqlx prepare` to update the sqlx-data.json

* Add redis caching for getting user notifications

* Fix new clippy warnings

* Remove log that shouldn't have been committed

* Batch insert of notifications (untested)

* sqlx prepare...

* Fix merge conflict things and use new redis struct

* Fix bug with calling delete_many without any elements (caught by tests)

* cargo sqlx prepare

* Add tests around cache invalidation (and fix bug they caught!)

* Some test reorg based on code review suggestions

src/database/models/team_item.rs

@@ -261,12 +261,7 @@ impl TeamMember {
                 let mut members = members.collect::<Vec<_>>();
 
                 redis
-                    .set(
-                        TEAMS_NAMESPACE,
-                        id.0,
-                        serde_json::to_string(&members)?,
-                        None,
-                    )
+                    .set_serialized_to_json(TEAMS_NAMESPACE, id.0, &members, None)
                     .await?;
                 found_teams.append(&mut members);
             }