[CLEA-OS] Pre-Release version of Clea OS

MAIN FEATURES

• SysData Support
• RAUC Support (to improve)
• Clea Cloud Support (with edgehog-device-runtime and astarte-message-hub)
• Docker Support

DISK LAYOUT

• Basic disk layout with single partitions (no redundant slots)
• Redundant symmetric A/B slot
• Dedicated SysData partition
• Clea OS system-boot partition (as EFI data partition)
• Clea OS initramfs

Graphics

• Psplash support (to improve)
• Plymouth (to improve)
• Wayland Support

OTHERS

• Full support to Yconfig tree for the configuration tool
• Compatible with meta-seco-bsp layer
• Versioning tool