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/pat_item.rs

@@ -169,7 +169,7 @@ impl PersonalAccessToken {
 
             for pat in db_pats {
                 redis
-                    .set(PATS_NAMESPACE, pat.id.0, serde_json::to_string(&pat)?, None)
+                    .set_serialized_to_json(PATS_NAMESPACE, pat.id.0, &pat, None)
                     .await?;
                 redis
                     .set(
@@ -195,9 +195,8 @@ impl PersonalAccessToken {
         E: sqlx::Executor<'a, Database = sqlx::Postgres>,
     {
         let res = redis
-            .get::<String, _>(PATS_USERS_NAMESPACE, user_id.0)
-            .await?
-            .and_then(|x| serde_json::from_str::<Vec<i64>>(&x).ok());
+            .get_deserialized_from_json::<Vec<i64>, _>(PATS_USERS_NAMESPACE, user_id.0)
+            .await?;
 
         if let Some(res) = res {
             return Ok(res.into_iter().map(PatId).collect());