Move flake8 config from toml to .flake8 as flake8 does not play nice with pyproject.toml and add pre-commit hook for flake8

.pre-commit-config.yaml

@@ -22,4 +22,18 @@ repos:
     rev: 23.1.0
     hooks:
       - id: black
-        args: [--line-length, "79", --experimental-string-processing]
+        args: ["--config", "pyproject.toml"]
+
+  # python import sorting
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.12.0
+    hooks:
+      - id: isort
+        args: ["--settings-path", "pyproject.toml"]
+
+  # python check (PEP8), programming errors and code complexity
+  - repo: https://github.com/PyCQA/flake8
+    rev: 6.0.0
+    hooks:
+      - id: flake8
+        args: ["--config", ".flake8"]