Implement a speech server for Spiel

Spiel is a project to bring a new architecture for speech synthesis on Linux

• https://github.com/eeejay/spiel
• https://blog.monotonous.org/2024/01/10/Introducing-Spiel/

If Spiel is available - Orca should be able to use it for TTS.

Orca supports multiple backends for TTS already https://gitlab.gnome.org/GNOME/orca/-/blob/main/src/orca/speechserver.py