Migrate RDM6300_UART from nf-Community-Contribution to IoT.Device

Warning: need some alignment with other RFID readers
Please check all the details from the existing RFID, PN532, PN5180, MFRC522 and also all the cards.
Original binding to migrate: https://github.com/nanoframework/nf-Community-Contributions/tree/master/drivers/RFID_RDM6300_UART