feat: prepareGetCredential

[Tkko]

Feature Request: Add prepareGetCredential Method Support for Android Credential Manager

Objective:

Implement the prepareGetCredential method to reduce latency when showing the account selector in the getCredential process on Android 14 or higher.

Tasks:

1. Review API Documentation:

   • Study the prepareGetCredential method in the Android Credential Manager API.
   • Understand how to create GetCredentialRequest with options like getPublicKeyCredentialOption and getPasswordOption.

2. Native Android Implementation:

   • Implement the prepareGetCredential method to:
     • Accept GetCredentialRequest with relevant options.
     • Return a PrepareGetCredentialResponse object with cached data.

3. Flutter Integration:

   • Add a Dart API for this method:

     Future<SmartAuthResult> prepareGetCredential(params);

   • Define a model for PrepareGetCredentialResponse to encapsulate cached data results.

4. Combine with getCredential:

   • Ensure prepareGetCredential works seamlessly with the existing getCredential API.
   • Use cached data from the PrepareGetCredentialResponse to reduce latency in UI rendering.

5. Error Handling:

   • Handle cases where:
     • prepareGetCredential is called on unsupported Android versions.
     • Invalid or unsupported options are passed.

6. Documentation:

   • Update the documentation to explain:
     • The purpose of prepareGetCredential.
     • Usage examples and supported Android versions.
   • Highlight its benefits for reducing latency in credential selection.

7. Sample App:

   • Add a demonstration in the sample app showing how prepareGetCredential enhances the getCredential flow.
     Let me know if this works or needs further refinement!