chore(analytics): deprecation warnings for v8 API ahead of future major release

[russellwheatley]

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[russellwheatley]

@mikehardy - Started this and I wanted to get your thoughts on the modular event methods we've ported over.

The firebase-js-sdk doesn't have methods for every event, they just have logEvent() to be used for custom and reserved events: https://firebase.google.com/docs/reference/js/analytics

Wondering whether we should deprecate all the modular methods we've ported over and just use logEvent()?

examples: https://github.com/invertase/react-native-firebase/blob/main/packages/analytics/lib/modular/index.js#L165-L187

Part of me thinks they're useful but another part thinks we should stick to firebase-js-sdk API 🤔

[mikehardy]

@russellwheatley Deviating from firebase-js-sdk API is a slippery slope and at least personally I can only justify it when there is a native method that's really useful and has no analog we can do with firebase-js-sdk - logEvent seems sufficient as an analog, to me. I don't think the specific methods meet the bar to justify deviation from firebase-js-sdk, so I'd deprecate them and go 100% JS API here

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