[Android] Implemented material3 support for Button (#33173)

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## Description of Change
 
This pull request adds support for Material 3 styling for the Button
control on Android in .NET MAUI. It introduces runtime feature toggling
for Material 3, configures the necessary Android resources and theming
infrastructure, and applies Material 3 styling to Button controls.
 
### Material 3 Button support and theming:
 
- **Added `MauiMaterialButton` style**, which extends
`Widget.Material3.Button` and applies Material 3 design to MAUI buttons.
This style removes Android Material 3 default constraints (minWidth,
minHeight, padding, insets) to allow full MAUI control over button
sizing and layout, and sets `iconSize` to 0dp for proper icon
sizing.[[1]](diffhunk://#diff-ad5ac218072f5fc910079c411a1cb0a014f67083b7bcbbfd3e8fd041f4a1588eR39-R55)
 
- **Integrated `MauiMaterialButton` into Material 3 base theme** by
setting `materialButtonStyle` attribute to reference the custom button
style, ensuring all buttons automatically receive Material 3 styling
when the feature is enabled.
[[1]](diffhunk://#diff-ad5ac218072f5fc910079c411a1cb0a014f67083b7bcbbfd3e8fd041f4a1588eR8)


Fixes #33172

### Screenshots

Material Design Spec -
[Button](https://m3.material.io/components/buttons/specs)
| Material 2  | Material 3 |
|---------|--------|
| <img height=600 width=300
src="https://github.com/user-attachments/assets/dd767cb0-2672-4514-bdb6-7b2cb8582e14">
|  <img height=600 width=300
src="https://github.com/user-attachments/assets/92e69117-fc8b-4942-898b-aa129bead4dc"> 
|

Author: Dhivya-SF4094