referrers for all platforms

[haileyok]

Relies on #4654

Why

We currently are not able to track referrers if the user is on native. This PR introduces a way for us to - when possible - see those referrals.

How

There's a little bit of native code needed on each platform.

iOS

On iOS, we can get the referrerURL from NSUserActivity. See https://developer.apple.com/documentation/foundation/nsuseractivity/2875762-referrerurl

This requires a little plugin to add some code to our AppDelegate.mm. Whenever a user opens the app through a Universal Link, we can - when it is provided by the browser - record the referrer URL here. To make things simple and reduce the scope of the plugin, I am just storing the URL to NSUserDefaults and then retrieving it in our module.

We also are able to get the same for deep links, also in the AppDelegate. See https://developer.apple.com/documentation/uikit/uiapplicationopenurloptionssourceapplicationkey

The same process is used here: save the value to NSUserDefaults and retrieve it through our module.

The build plugin in this PR adds the necessary lines to the AppDelegate.mm file to achieve this.

Android

On Android, we need to do two things to get this information:

• Check incoming intents for Intent.EXTRA_REFERRER, which will be the URI of the website that the request is coming from - if it is coming from one.
• Otherwise, check the current activity's referrer property, which will tell us the application the request was made from.

Since we can access these straight from the module code, all we do is store the intent whenever it comes in and return it to the JS side when calling getReferrerAsync().

The getGooglePlayReferrerInfoAsync() call uses the Google Play Install Referrer API (see https://developer.android.com/google/play/installreferrer) to retrieve the URL that referred the user to the app store. This will be used for starter packs. I've already added this code to the starter packs PR, but once we merge that in and later review this, I'll just migrate the code to use this single module instead.

Web

Same process as what exists in the app right now, but just made to follow the same API as iOS and Android.

Sending to Statsig

On iOS and Android, we will send this info to Statsig in the useIntentHandler hook, whenever we receive a new link into the app.

On web, I've moved this from being a custom user property to being it's own event - again to align with how we handle this on iOS and Android. Whenever send the init event to Statsig, we will also send this event if needed.

Test Plan

1. Ensure the build plugin functions. Check the AppDelegate.mm to make sure it looks good (there are commented blocks that signify where code is being added). App should still build on iOS.
2. Test web:

• You can do this with a little console log and inspect-elementing a URL on another site to lead to Bluesky.

3. Test Android:

• You can add a console log into useIntentHandler to check the status
  
  

4. Test iOS:

• A good bit harder to test this one since you need to be using a physical device - or at least have it built with the correct provisioning profile - to test universal links. We should verify through Statsig that we are receiving good info from iOS devices.

[render]

Your Render PR Server URL is https://social-app-pr-4514.onrender.com.

Follow its progress at https://dashboard.render.com/web/srv-cplv9e5ds78s738a1760.

[github-actions]

The Pull Request introduced fingerprint changes against the base commit:

Fingerprint diff

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[github-actions]

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[gaearon]

gonna wait with this until after sp

[haileyok]

see https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/to-string.html

[mary-ext]

seems like this broke web?

getReferrerInfoAsync() is returning null

social-app/src/Navigation.tsx

Lines 773 to 775 in 2c754bf

	if (isWeb) {
	Referrer.getReferrerInfoAsync().then(info => {
	if (info && info.hostname !== 'bsky.app') {