Will Caulfield

The [`getLastPushPayload()`](https://github.com/Iterable/react-native-sdk/blob/93bf1d42ce01fcd4c872342db3c371c2c8df7ead/ts/Iterable.ts#L283-L286) function's behavior is not consistent across platforms. On Android, `getLastPushPayload()` only returns data corresponding to the current app session because it [stores data in memory](https://github.com/Iterable/iterable-android-sdk/blob/4c92a3c09800010fb02fc55a1ca6a66d16b6766b/iterableapi/src/main/java/com/iterable/iterableapi/IterableApi.java#L108-L110) which gets forgotten...