Make speed test execution frequency of Netgear integration configurable

The Netgear integration executes calls to every two hours if any one of the uplink, downlink, or ping sensors are enabled. This results in a significant consumption of data which is problematic for users that are bandwidth constrained / capped by their ISP. In my case, this scheduling resulted in 35% consumption of my allotted data. I don’t want to lose the ability to periodically measure the bandwidth of my internet connection, but I would like to be able to configure it to run much less frequently to reduce the consumption of my ISP-constrained data. I acknowledge that the documentation for the Integration does call out the risk of excessive data consumption.