add tox.ini with linting setup (aws#2594)

Co-authored-by: Wang Napieralski <wru@88665a0d5290.ant.amazon.com>

Author: icywang86rui

tox.ini

@@ -0,0 +1,34 @@
+# Tox (http://tox.testrun.org/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+
+[tox]
+envlist = black-format,black-check,black-nb-check,black-nb-format
+skipsdist=True
+
+[testenv:black-format]
+setenv =
+    LC_ALL=C.UTF-8
+    LANG=C.UTF-8
+deps = black
+commands =
+    black -l 100 ./
+
+[testenv:black-check]
+setenv =
+    LC_ALL=C.UTF-8
+    LANG=C.UTF-8
+deps = black
+commands =
+    black -l 100 --check ./
+
+[testenv:black-nb-check]
+deps = black-nb
+commands =
+    black-nb -l 100 --check ./
+
+[testenv:black-nb-format]
+deps = black-nb
+commands =
+    black-nb -l 100 ./