feat(gpodder_sqlite): added benchmarking support

gpodder_sqlite/benches/common.rs

@@ -0,0 +1,16 @@
+use gpodder::{AuthStore, User};
+use gpodder_sqlite::SqliteRepository;
+
+pub fn setup() -> (SqliteRepository, Vec<User>) {
+    let store = SqliteRepository::in_memory().unwrap();
+    let mut users = Vec::new();
+
+    for i in 0..1000 {
+        let username = format!("test{}", i + 1);
+        let password_hash = format!("dummyhash{}", i + 1);
+
+        users.push(store.insert_user(&username, &password_hash).unwrap());
+    }
+
+    (store, users)
+}