Promotional subscription overrides normal subscription in `customerInfo.entitlements`

• I have updated Purchases SDK to the latest version
• I have read the Contribution Guidelines
• I have searched the Community
• I have read docs.revenuecat.com
• I have searched for existing Github issues

Hi all,

When I have both normal and promotional subscriptions active (and they have the same entitlement), I naturally see only one of them (only promotional) in the customerInfo.entitlements, since it is a dictionary with unique keys. But there is no way that I can get information about both subscriptions, because there is no customerInfo.subscriptions field.

And for Play Store it's important to know some information about a normal subscription, since it influences the googleProductChangeInfo for purchasePackage method.

The CustomerInfo interface (https://revenuecat.github.io/react-native-purchases-docs/7.15.0/interfaces/CustomerInfo.html).

1. Environment
   1. Platform:Android
   2. SDK version: 7.6.0
   3. OS version: 14
   4. Xcode/Android Studio version: using expo
   5. React Native version: 0.72.5
   6. SDK installation (CocoaPods + version or manual): expo
   7. How widespread is the issue. Percentage of devices affected: Testing on my own device before pushing to production at the moment
2. Debug logs that reproduce the issue
3. Steps to reproduce, with a description of expected vs. actual behavior
4. Other information (e.g. stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, etc.)

Additional context
Add any other context about the problem here.

Start with the CustomerInfo interface documentation and the customerInfo.entitlements and purchasePackage flows described in the issue. Determine how both normal and promotional subscriptions should be represented while preserving the Google product change information; the issue is complete when callers can access the needed normal subscription data without losing the promotional entitlement.