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/__main__.py

@@ -1,7 +1,4 @@
-"""Entry point for LogLens CLI."""
-
-import sys
-from loglens.cli.main import main
+from loglens.cli.commands import main
 
 if __name__ == "__main__":
-    sys.exit(main())
+    main()