Gutenberg settings tracking

[koke]

Adds the Gutenberg setting tracking described on wordpress-mobile/gutenberg-mobile#556:

• App setting to enable Gutenberg: gutenberg_enabled when switched on, gutenberg_disabled when switched off.
• Add a gutenberg_enabled property to the user properties that are sent with every event.

To test:

The best way to test the events is to look at the logs, but it gets too noisy with React Native. You can edit the Xcode scheme, and in Run > Arguments enable the OS_ACTIVITY_MODE=disable environment variable. You can also search for 🔵 in the log but that would filter out the event properties 😞

You can't see the userProperties in the logs, so you can add a breakpoint and inspect self.tracksService.userProperties

Also, it's a good idea to do a final check and see if the expected events made it into the backend, you might have to wait ~5 minutes for those to appear.

cc @hypest

[etoledom]

Looks good! 🎉

• Code looks shinny and Xcode shows that everything is working.
• Both events and the property are arriving correctly to Tracks ✅

[peril-wordpress-mobile]

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