[Library Manager] Please add OpenMV Arduino RPC library

[kwagyeman]

This library provides a rich remote function call API for Arduino's to talk to other Arduinos, to the OpenMV Cam, to a PC, or any other device over multiple data buses like SPI, I2C, CAN, and UART.

https://github.com/openmv/openmv-arduino-rpc

[cmaglie]

Done.