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[FSSDK-13250] Support AsyncStorage v3 in React Native (#1178)

## Summary
- **AsyncStorage v3 support.** v3 removed `multiGet` in favour of `getMany`, and no longer exports the `AsyncStorageStatic` type. The React Native AsyncStorage import shim now adds a `multiGet` built on `getMany` when the storage doesn't have one. It keeps the requested key order and returns `null` for missing keys. The removed type import is replaced with a local `AsyncStorageCompat` interface. v1/v2 storage is returned unchanged.
- **`AsyncStorageCache` now extends `AsyncStoreWithBatchedGet`.** It previously only implemented `AsyncStore`, so `getBatchedAsync` failed its `instanceof` check and read stored events with one `getItem` per key. Its `getBatched`, and therefore `multiGet`, was never called. Failed-event retries now read all stored events in one batched call.
- **Wider React Native peer ranges:**
  - AsyncStorage `<4.0.0` (was `<3.0.0`)
  - NetInfo `<13.0.0` (was `<12.0.0`)
  - `react-native-get-random-values` `>=1.11.0 <3.0.0` (was `^1.11.0`)
  - `fast-text-encoding` and `ua-parser-js` are now written as explicit `<2.0.0` ranges, allowing the same versions as before. `ua-parser-js` 2.x is licensed AGPL-3.0, so it stays excluded.
- **Test fix:** a leaked `mockImplementationOnce` in `event_processor_factory.react_native.spec.ts` was making a later test construct a real `AsyncStorageCache`.
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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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