setupWithAnalytics missing support for Firebase

[ScottYelich]

setupWithAnalytics missing support for Firebase (ARAnalytics 4.0.0)

Perhaps: ARFIRAnalyticsKey

+ (void)setupWithAnalytics:(NSDictionary *)analyticsDictionary {
// ...
    if (analyticsDictionary[ARFIRAnalyticsKey]) {
        [self setupFirebaseAnalytics]; // :analyticsDictionary[ARFIRAnalyticsKey]];
    }

[orta]

Cool, wanna add that?

[ScottYelich]

I've added it locally... after I test it out and get Firebase working... I'd feel more comfortable making a PR.

[orta]

Awesome 👍