Steaming stdout support

[SilverRainZ]

snippet s | head -10:

Traceback (most recent call last):
  File "/home/la/.local/bin/snippet", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/la/.local/lib/python3.12/site-packages/sphinxnotes/snippet/cli.py", line 185, in main
    args.func(args)
  File "/home/la/.local/lib/python3.12/site-packages/sphinxnotes/snippet/cli.py", line 211, in _on_command_list
    print(row)
BrokenPipeError: [Errno 32] Broken pipe