Flipper Zero Mayhem back and camera protectors

SummaryThe camera protector fits any ESP32CAM and the back protector fits mayhem pcb v1.2 to v2.0 and newer:https://github.com/eried/flipperzero-mayhem/wiki/VersionsPrint and test fit, you might resize to +/- 0.2% depending on the filament and your printer.Designed originally for https://github.com/eried/flipperzero-mayhem/