fix: avoid NativeEventEmitter warnings when OtpVerify module shape is incomplete

[tomerh2001]

Summary

• normalize the module passed to NativeEventEmitter
• use NativeModules.OtpVerify when available, otherwise fall back to an empty object
• ensure addListener and removeListeners exist as no-op functions before creating NativeEventEmitter

Why

On newer React Native versions, NativeEventEmitter enforces both of these constraints:

• the constructor argument must be non-null
• when provided, the native module should expose addListener and removeListeners

Some setups of this package can violate one or both constraints, causing startup warnings and/or an invariant runtime error.

Validation

• Verified in an RN 0.81 app using this package that startup warnings are removed.
• Verified that the runtime invariant (new NativeEventEmitter() requires a non-null argument) is avoided with this normalization.