add another async example

Author: KRRT7

src/asynchrony/various.py

@@ -1,4 +1,5 @@
 import time
+import asyncio
 
 
 async def retry_with_backoff(func, max_retries=3):
@@ -13,3 +14,17 @@ async def retry_with_backoff(func, max_retries=3):
             if attempt < max_retries - 1:
                 time.sleep(0.0001 * attempt)
     raise last_exception
+
+
+async def fetch_user(user_id: int) -> dict:
+    """Simulates fetching a user from a database"""
+    await asyncio.sleep(0.0001)
+    return {"id": user_id, "name": f"User{user_id}"}
+
+
+async def fetch_all_users(user_ids: list[int]) -> list[dict]:
+    users = []
+    for user_id in user_ids:
+        user = await fetch_user(user_id)
+        users.append(user)
+    return users