Add simple generator-based rate limiter utility

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import time

def rate_limiter(calls_per_second):

    """

    A simple generator-based rate limiter.

    Yields when the next call is allowed.

    """

    interval = 1.0 / calls_per_second

    next_call = time.time()

    while True:

        now = time.time()

        if now < next_call:

            time.sleep(next_call - now)

            now = time.time()

        yield

        next_call = now + interval

if __name__ == "__main__":

    # Example usage: limit to 2 calls per second

    limiter = rate_limiter(2)

    start = time.time()

    for i in range(5):

        next(limiter)

        print(f"Call {i} at {time.time() - start:.2f}s")