feat(cleaner): ✨ add command prune

this new command will be called by cron-like process to clean purge old logs and old mails. All files were formatted and mail_utils was renamed in utils since it now defines utility function not only for mail functions.

tests/test_parser.py

@@ -19,7 +19,7 @@ def empty_log_file_fixture(invalid_log_dir: Path) -> Path:
 @pytest.fixture(name="bad_log_file")
 def bad_log_file_fixture(invalid_log_dir: Path) -> Path:
     """Path of a file containing only incorrectly formatted lines.
-    
+
     Each line fails at a different point in LOG_PATTERN
     (invalid IP, missing timestamp, missing DOSSIER EN COURS, etc.).
     No LogEntry should be produced.
@@ -93,7 +93,7 @@ def test_parse_lines():
 
 
 def test_parse_valid_lines(specific_logs: Path):
-    """Assert parse_lines works for all valid lines.""" 
+    """Assert parse_lines works for all valid lines."""
     # selected valid logs
     with open(specific_logs, "r") as file:
         log_lines = file.readlines()