Add grpcio-tools

[SohierDane]

Add a dependency on grpcio-tools so we can recompile proto stubs in real time for kaggle_evaluation. It's a small library (<3 MB) and for my purposes the exact version doesn't much matter so I'm hoping this isn't a controversial addition. We do have alternatives if this addition isn't feasible but they're much more invasive, most likely migrating from gRPC to HTTP.

[Blevins42069]

#361

[rosbo]

Can you add a simple smoke test under the tests forder for the grpcio-tools package for the method you are using to ensure we don't regress:

docker-python/tests/test_pandas.py

Lines 1 to 9 in 8cc47ea

	import unittest
	import pandas as pd
	class TestPandas(unittest.TestCase):
	def test_read_csv(self):
	data = pd.read_csv("/input/tests/data/train.csv")
	self.assertEqual(100, len(data.index))