style: limit line length to 79 characters

Limited the lengths of all lines to 79 characters (if possible).
Additionally, some other lines were breaked for consistence.

tests/unit/cli/test_python.py

@@ -16,7 +16,9 @@ import pathlib
 import pytest
 from jcloud_docsgen.cli.cli import create_argument_parser, main as cli_main
 from jcloud_docsgen.cli.languages.python import parse_sections_list
-from jcloud_docsgen.core.python import PythonDefinitionDocumentationIncludeSections
+from jcloud_docsgen.core.python import (
+    PythonDefinitionDocumentationIncludeSections
+)
 
 @pytest.mark.parametrize('include,exclude,expected', [
     (