Fix python testing

[markkohdev]

I noticed that we're not running tox during our github actions? When I run tox -e check-formatting locally it's failing black formatting checks

$ tox -e check-formatting
check-formatting: commands[0]> black tests --diff --check
--- /Users/markkoh/spotify/voyager/python/tests/test_index_recreation.py    2023-11-10 17:53:56.849930+00:00
+++ /Users/markkoh/spotify/voyager/python/tests/test_index_recreation.py    2023-11-10 17:54:05.819796+00:00
@@ -36,20 +36,26 @@
     [voyager.Space.Euclidean, voyager.Space.Cosine],
     ids=lambda x: x.name if hasattr(x, "name") else str(x),
 )
 @pytest.mark.parametrize(
     "storage_data_type",
-    [voyager.StorageDataType.E4M3, voyager.StorageDataType.Float8, voyager.StorageDataType.Float32],
+    [
....
....
....
Oh no! 💥 💔 💥
4 files would be reformatted, 2 files would be left unchanged.
check-formatting: exit 1 (0.48 seconds) /Users/markkoh/spotify/voyager/python> black tests --diff --check pid=26135
  check-formatting: FAIL code 1 (0.53=setup[0.05]+cmd[0.48] seconds)
  evaluation failed :( (0.63 seconds)

This PR adds a github action to run tox during review and master builds.

Additionally, this PR aligns black with our flake8 configuration of 120 char line length and reformats files as necessary