This commit introduces a new `RevPiConfig` class to manage RevPi device
configuration details, such as model, serial, compute module type, WiFi,
and ConBridge detection. It parses CPU info from `/proc/cpuinfo` and
leverages helper methods for hardware-specific checks, enhancing the
middleware's ability to identify and manage hardware features.
Introduced the `configure_gui` function to manage GUI enabling,
disabling, availability, and status retrieval. Updated the
`AVAILABLE_FEATURES` dictionary to include GUI management functionality,
leveraging systemd and os module operations.
Introduced `InterfaceRevpiConfig` to manage feature actions like
enable/disable, status, and availability using D-Bus. Includes support
for predefined features with systemd integration and exception handling
for unsupported features.
