input: Write a function to convert raw text into a list of lists where each sublist contains individual words from each line.
  assert TextParser("Hello World\nThis is a test").parse() == [['Hello', 'World'], ['This', 'is', 'a', 'test']]
  assert TextParser("Python is great\nfor data processing").parse() == [['Python', 'is', 'great'], ['for', 'data', 'processing']]
  assert TextParser("SingleLine").parse() == [['SingleLine']]
output: class TextParser:
      def __init__(self, text):
          self.text = text
      
      def parse(self):
          return [line.split() for line in self.text.split('\n')]