[Android] Implemented material3 support for ActivityIndicator

[Dhivya-SF4094]

Description of Change

This pull request introduces support for a Material Design 3 styled ActivityIndicator on Android, allowing the app to use the new Material component when the Material3 feature is enabled. The main changes involve conditional registration of a new handler, the implementation of a MaterialActivityIndicatorHandler, and the addition of a custom MaterialActivityIndicator control for Android.

Material3 ActivityIndicator support for Android:

• Added a new MaterialActivityIndicatorHandler class that extends ActivityIndicatorHandler and creates a MaterialActivityIndicator (the new Material3 control) as its platform view. It also customizes layout behavior to ensure proper sizing and centering.
• Implemented the MaterialActivityIndicator control in MaterialActivityIndicator.cs, inheriting from CircularProgressIndicator and overriding measurement logic to ensure the indicator remains square and properly sized according to Material guidelines.

Handler registration logic:

• Updated the AddControlsHandlers extension method to conditionally register either MaterialActivityIndicatorHandler or the classic ActivityIndicatorHandler for ActivityIndicator, based on whether Material3 is enabled on Android.

Issues Fixed

Fixes #33479

Material3 Spec ActivityIndicator

Output Screenshot

Material 2	Material 3
Material2_ActivityIndicator.mov	Material3_ActivityIndicator.mov