fix: Configure isort and black

Since black has strict formatting including
imports, let isort use profile with black.

And adjust black line length as 120 for
linting.

Author: JessicaJang

pyproject.toml

@@ -61,3 +61,9 @@ awspub = "awspub.cli:main"
 [tool.poetry-dynamic-versioning]
 enable = true
 vcs = 'git'
+
+[tool.isort]
+profile = "black"
+
+[tool.black]
+line-length = 120