Use [BindableProperty] for RatingView

[CliffAgius]

Description of Change

Converted the RatingView from using longhand Binding to using the Internal BindableProperty Source Generated version to make the code look and read cleaner.

PR Checklist

• Has a linked Issue, and the Issue has been approved(bug) or Championed (feature/proposal)
• Has tests (if omitted, state reason in description)
• Has samples (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Changes adhere to coding standard
• Documentation created or updated: https://github.com/MicrosoftDocs/CommunityToolkit/pulls

Additional information

[Copilot]

Pull request overview

This PR converts the RatingView control from using longhand BindableProperty declarations to the internal source-generated [BindableProperty] attribute approach, making the code more concise and maintainable. The changes also add XML documentation comments to all properties and modify the RatingViewDefaults class to use fields instead of properties.

Key changes:

• Replaced 10 manually defined BindableProperty declarations with source-generated [BindableProperty] attributes
• Added comprehensive XML documentation to all public properties
• Introduced default value creator methods and coercion methods to work around source generator limitations
• Removed two unit tests that directly tested BindableProperty.ValidateValue methods

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 12 comments.

File	Description
src/CommunityToolkit.Maui/Views/RatingView/RatingView.shared.cs	Converted from longhand BindableProperty to source-generated attributes; added XML docs; implemented default value creators and coercion methods
src/CommunityToolkit.Maui.UnitTests/Views/RatingView/RatingViewTests.cs	Removed two validator tests that are no longer applicable with source-generated properties
src/CommunityToolkit.Maui.Core/Primitives/Defaults/RatingViewDefaults.shared.cs	Changed properties to fields (readonly/const) and added new constant for RatingViewFillOption

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[TheCodeTraveler]

Thanks @CliffAgius!

I updated this PR from the main branch to bring in the improvements I added to BindablePropertySourceGenerator, like support for Default Values like enum, double, etc. and updated the Bindable Property Attributes accordingly.

I also moved the ArgumentOutOfRange validation to PropertyChanging to ensure the property doesn't get set to an invalid value; PropertyChanged only fires after the Bindable Property's value has been updated.

I also removed the Validators from Rating and MaximumRating because they block PropertyChanging and PropertyChanged from running if the validation is false; MAUI runs the Validators first, then updates the value of the Bindable Property.

And I also added [Obsolete] to FillWhenTapped . CoPilot helped point out that we don't use FillWhenTapped anywhere in the RatingView source code, and it isn't documented anywhere in our docs. It must've been a vestige from when we first created RatingView that we forgot to remove. We'll remove it in the .NET 11 PR.