Refactor code for improved readability and consistency

- Simplified error handling in `PostgresApContentQuery` and `SqliteApContentQuery` by aligning the formatting of `try_get` calls.
- Removed unnecessary line breaks and improved formatting in various repository implementations for better readability.
- Consolidated imports in `lib.rs` and `factory.rs` to maintain a cleaner structure.
- Enhanced consistency in async function signatures across multiple files.
- Updated test helpers and use cases to streamline code and improve clarity.
- Refactored `InMemory` repositories to enhance readability by aligning method implementations.

crates/adapters/activitypub/src/federation_event_bridge.rs

@@ -21,15 +21,14 @@ impl k_ap::EventPublisher for FederationEventBridge {
             FederationEvent::BackfillRequested {
                 owner_user_id,
                 follower_inbox_url,
-            } => {
-                self.domain_publisher
-                    .publish(&DomainEvent::BackfillFollower {
-                        owner_user_id: UserId::from_uuid(owner_user_id),
-                        follower_inbox_url,
-                    })
-                    .await
-                    .map_err(|e| anyhow::anyhow!(e.to_string()))
-            }
+            } => self
+                .domain_publisher
+                .publish(&DomainEvent::BackfillFollower {
+                    owner_user_id: UserId::from_uuid(owner_user_id),
+                    follower_inbox_url,
+                })
+                .await
+                .map_err(|e| anyhow::anyhow!(e.to_string())),
             _ => {
                 tracing::debug!("ignoring federation event: {:?}", event);
                 Ok(())