Refactor existing send_data method to include location (lat/lon/ele) and created_at (not currently supported) metadata as a list, rather than having an additional send_location_data method.

Similar to the implementation in Adafruit IO CircuitPython:
https://github.com/adafruit/Adafruit_CircuitPython_AdafruitIO/blob/master/adafruit_io/adafruit_io.py#L136

Note: create_data will also need to include a path for the metadata