Feat - Add isort in the pre-commit configuration

This is compatible with the current black configuration.
See : psf/black#127

.isort.cfg

@@ -0,0 +1,7 @@
+[settings]
+multi_line_output=3
+line_length=88
+known_third_party=astroid, sphinx, isort, pytest
+include_trailing_comma=True
+skip_glob=*/functional/**,*/input/**,*/test/extension/**,*/test/regrtest_data/**,*/test/data/**
+project=pylint

.pre-commit-config.yaml

@@ -11,3 +11,7 @@ repos:
     hooks:
     -   id: trailing-whitespace
     -   id: end-of-file-fixer
+-   repo: https://github.com/pre-commit/mirrors-isort
+    rev: v4.3.13
+    hooks:
+    -   id: isort