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/threads.rs

@@ -410,6 +410,7 @@ pub async fn thread_send_message(
                     .insert_many(
                         members.into_iter().map(|x| x.user_id).collect(),
                         &mut transaction,
+                        &redis,
                     )
                     .await?;
                 }
@@ -435,7 +436,7 @@ pub async fn thread_send_message(
                             report_id: Some(report.id.into()),
                         },
                     }
-                    .insert(report.reporter, &mut transaction)
+                    .insert(report.reporter, &mut transaction, &redis)
                     .await?;
                 }
             }