add resize flag

[romerocesar]

current state

currently the code resizes every frame captured before sending it to the groundlight API using a default resolution without a strong reason behind it. A --noresize flag can be used to send the frame as it was captured.

desired state

a -r, --resize=RES allows the user to provide the desired resolution to be sent and not resize by default.

guestions

• the user typically cares about predictions and not image resolution, and they have no knowledge of what may be better for those predictions. what guidance can we provide to users of this flag?