feat: adds target rn wrapper

[dsoffiantini]

Description

Adds wrapper for AEPTarget in React Native SDK

How Has This Been Tested?

Unit tests have been added and all existing tests pass

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[cacheung]

Need to add Target package to the main page - https://github.com/adobe/aepsdk-react-native/tree/target

[cacheung]

In Sample App iOS or Android, in the registration code, I don't see Target.
Android example - https://github.com/adobe/aepsdk-react-native/blob/target/apps/AEPSampleApp/android/app/src/main/java/com/aepsampleapp/MainApplication.java#L121

iOS: https://github.com/adobe/aepsdk-react-native/blob/target/apps/AEPSampleApp/ios/AEPSampleApp/AppDelegate.mm#L75

[cacheung]

Looks good!