input: Write a python function to send a POST request with data and return the response text.
  assert send_post_request("http://www.example.com/submit-form.php", {"name": "John Doe", "email": "john.doe@example.com", "message": "Hello"}) == "Expected Response Text"
  assert send_post_request("http://www.example.com/submit-form.php", {"name": "Jane Doe", "email": "jane.doe@example.com", "message": "Hi"}) == "Another Expected Response Text"
output: import requests
  
  def send_post_request(url, data):
      response = requests.post(url, data=data)
      return response.text