Disable iOS 12 cellular connectivity monitor by default #415
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We've started seeing some crashes when using the
CTServiceRadioAccessTechnologyDidChange
notification withinClientNetworkMonitor
in production on iOS 12. This is an issue that's been reported in this radar: https://openradar.appspot.com/46873673To provide a workaround for this problem, I'm adding the option to opt out of the new iOS 12 API and to instead use the stable pre-iOS 12 API.
I'm planning to release a new version of SwiftGRPC with this fix after it's merged, which is what the second commit of this PR reflects.