Async/Awaited all db methods

This is a rather large PR which updates the async branch to have all the
database methods as an async fn.

Some iter/map logic needed to be changed to a stream::iter().then(), but
besides that most changes were just adding async/await where needed.

src/api/core/mod.rs

@@ -121,7 +121,7 @@ struct EquivDomainData {
 }
 
 #[post("/settings/domains", data = "<data>")]
-fn post_eq_domains(data: JsonUpcase<EquivDomainData>, headers: Headers, conn: DbConn) -> JsonResult {
+async fn post_eq_domains(data: JsonUpcase<EquivDomainData>, headers: Headers, conn: DbConn) -> JsonResult {
     let data: EquivDomainData = data.into_inner().data;
 
     let excluded_globals = data.ExcludedGlobalEquivalentDomains.unwrap_or_default();
@@ -133,14 +133,14 @@ fn post_eq_domains(data: JsonUpcase<EquivDomainData>, headers: Headers, conn: Db
     user.excluded_globals = to_string(&excluded_globals).unwrap_or_else(|_| "[]".to_string());
     user.equivalent_domains = to_string(&equivalent_domains).unwrap_or_else(|_| "[]".to_string());
 
-    user.save(&conn)?;
+    user.save(&conn).await?;
 
     Ok(Json(json!({})))
 }
 
 #[put("/settings/domains", data = "<data>")]
-fn put_eq_domains(data: JsonUpcase<EquivDomainData>, headers: Headers, conn: DbConn) -> JsonResult {
-    post_eq_domains(data, headers, conn)
+async fn put_eq_domains(data: JsonUpcase<EquivDomainData>, headers: Headers, conn: DbConn) -> JsonResult {
+    post_eq_domains(data, headers, conn).await
 }
 
 #[get("/hibp/breach?<username>")]