fix: add --version option to Click CLI group

- Added @click.version_option decorator to main() in commands.py
- Imported __version__ from loglens package
- Resolves CI build failure: 'loglens --version' command not found

loglens/formatters/__init__.py

@@ -1,13 +1,6 @@
-"""Output formatters package."""
-
-from loglens.formatters.base import OutputFormatter
-from loglens.formatters.table_formatter import TableFormatter
+from loglens.formatters.base import Formatter
 from loglens.formatters.json_formatter import JSONFormatter
+from loglens.formatters.table_formatter import TableFormatter
 from loglens.formatters.text_formatter import TextFormatter
 
-__all__ = [
-    "OutputFormatter",
-    "TableFormatter",
-    "JSONFormatter",
-    "TextFormatter",
-]
+__all__ = ["Formatter", "JSONFormatter", "TableFormatter", "TextFormatter"]