Missing consumer ProGuard rules causes AWSS3V4Signer removal with AGP 9 (R8 full mode)

[P-Emmy]

Describe the bug
R8 full mode (enabled by default in AGP 9) strips com.amazonaws.services.s3.internal.AWSS3V4Signer

To Reproduce

1. Create a simple app that initializes an S3 client (default signer).
2. Build a release APK/AAB with minifyEnabled=true (no custom keep rules).
3. Run the app: it crashes on the first S3 call with
   java.lang.IllegalStateException: Cannot create an instance of com.amazonaws.services.s3.internal.AWSS3V4Signer

Which AWS service(s) are affected?
com.amazonaws:aws-android-sdk-s3

Expected behavior
AWS SDK should ship consumer ProGuard rules so required signer classes are kept when R8 full mode is on.

Environment Information (please complete the following information):

• AWS Android SDK Version: 2.81.1
• Specific to simulators: No

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