Token bucket rate limiter

Simulate a token-bucket rate limiter. The bucket holds at most 'burst' tokens and refills at 'rate' tokens per second, capped at burst. Requests arrive at the given non-decreasing integer 'timestamps' (seconds). The bucket starts full. For each request, first refill by elapsed*rate since the previous request (clamped to burst), then admit the request if at least one token is available (consuming one) else deny. Return a list of booleans, one per request. An empty timestamp list returns an empty list.