feat(script): add tailscale

[AeroXuk]

Introduce a new installation script for Tailscale, including configuration options and requirements. Update documentation to reflect the addition.

This is based on the Custom Install Script found at https://hub.hexos.com/topic/4267-trial-tailscale-custom-install/.

I've editted and validated the install script against the TrueNAS app schema.

The following changes were made to the version from the forum:

• Removed default values for questions.
• Used the TrueNAS app schema descriptions in the installation_questions descriptions.
• Added application state directory to ensure_directories_exists.
• Added accept_routes to app_values with the default value from the truenas app schema.
• Reduced resource limits after observing the app running.