Reimplemented SimulatorLogPlugin to use log stream

[noomorph]

Description:

The existing SimulatorLogPlugin implementation appears to be not informative (does not include various NSLog messages, etc) and hacky (relies on tailing two temporary files which contain piped output from a simulator launched in a special way).

The suggested reimplementation is based on two extra commands:

/usr/bin/xcrun simctl spawn ${udid} log stream --level debug --style compact --predicate '${predicate}

, where the predicate is built via:

/usr/bin/xcrun simctl get_app_container ${udid} ${bundleId}

and looks like:

processImagePath beginsWith "${appContainer}"

Ultimately, the plugin now is able to produce logs like these:

2019-06-04 14:01:49.918 E  example[59318:22c78e] [com.wix.Detox:DetoxManager] Web socket failed to connect with error: Error Domain=NSPOSIXErrorDomain Code=61 "Connection refused" UserInfo={_kCFStreamErrorCodeKey=61, _kCFStreamErrorDomainKey=1}
2019-06-04 14:01:49.917 Df example[59318:22c7d0] [com.apple.network:] [C2 localhost:51820 tcp, legacy-socket] cancel
2019-06-04 14:01:49.920 Df example[59318:22c7d0] [com.apple.network:] [C2 localhost:51820 tcp, legacy-socket] cancelled

That should be helpful in troubleshooting various issues, including the one that blocks us from merging dinstruments-demoapp branch to master.

[LeoNatan]

Amazing!