Change setPersistenceEnabled to async function

[omedkane]

Description

This pull request updates the setPersistenceEnabled method in the MethodChannelDatabase class to be asynchronous, ensuring that the persistence setting is fully applied before continuing. This change improves the reliability and consistency of enabling or disabling persistence.

• Asynchronous persistence setting:
  • Changed setPersistenceEnabled in MethodChannelDatabase from a synchronous void method to an asynchronous Future<void> method, and now properly awaits the underlying platform call.
    In Android, when application reloads calling setPersistenceEnabled in the main function it causes a error saying it should called only once and before any reference, and there's no way to catch that error because it is a synchronous method calling an async method which throws the error.

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