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/routes/v2/version_creation.rs

@@ -409,7 +409,7 @@ async fn version_create_inner(
             version_id,
         },
     }
-    .insert_many(users, &mut *transaction)
+    .insert_many(users, &mut *transaction, redis)
     .await?;
 
     let response = Version {