`@realm/react`: Passing an app as a prop to `AppProvider`

[sync-by-unito]

Add the ability for the AppProvider to take in an app as a prop instead of configuration parameters, i.e.

const realmApp = new Realm.App(...);

<AppProvider
	...
	app={realmApp}
	...
>
</AppProvider> 

Similar to https://jira.mongodb.org/browse/RJS-2648, it is likely that during the manual realm scenario, a user would also like to manage and pass the app manually.

This would help completely handle cases such as using react-navigation

#6233

[sync-by-unito]

➤ PM Bot commented:

Jira ticket: RJS-2861