Android: cleanup implementation (remove deprecated async task, share code between old/new architecture, prevent crashes on curson management)

[EnricoMazzu]

Step of rewark:

1. Remove usage of deprecated AsyncTask
2. add check to prevent crashes in cursor read (invalid indexing or other similar condition)
3. Check if create a Impl class for prevent code duplication between old and new architecture

NB: work on implementation , not on apis contract ->No breaking changes

I will submit a pull request in the next days

[EnricoMazzu]

@morenoh149 : in my refactoring I've seen that on android side there is a partial management of Android permission.
I can complete this work and make contacts plugin not dependent from external permission package also in android.
Is there some specific reason for depend on external android permission package for this check?

[morenoh149]

@EnricoMazzu coud you share a link to the lines in question? If we can remove a dependency that would be a win

[EnricoMazzu]

Hi @morenoh149

[ContactsManager.java] (https://github.com/morenoh149/react-native-contacts/blob/v8.0.3/android/src/newarch/com/rt2zz/reactnativecontacts/ContactsManager.java)

methods:
void requestReadContactsPermission()
protected static void onRequestPermissionsResult(...)

I can work to handle permission directly in the module code (without delegate this task for android to the app and AndroidPermission module)

[morenoh149]

@EnricoMazzu sounds good

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