Flipperzero-protobuf

Added
- System message: UpdateRequest
- Storage messages: BackupCreateRequest, BackupRestoreRequest

Fixed
- BLE disconnection after writing / erasing FLASH

Added
- System messages: ProtobufVersion
- Support parallel RPC sessions
- Screen streaming optimization

Added
- Code owners
- CI setup
- System messages: Ping, Reboot, DeviceInfo, FactoryReset, DateTime,
AudiovisualAlert
- Storage messages: Info, Stat, Read, Write, Delete, Mkdir, Md5sum,
Rename
- App messages: Start, LockStatus
- Gui messages: ScreenStream, ScreenFrame, SendInput, VirtualDisplay

Added
- Introduced Flipper Zero Protobuf repository
- StorageList messages