Resolve required keyword order for partial reactive properties.

[ChrisPulman]

What kind of change does this PR introduce?

Fixes #237

What is the current behavior?

#237

What is the new behavior?

Documentation Updates:

• Updated README.md to document new [Reactive] attribute features, including initializer support, SetModifier, Inheritance, and UseRequired options. These new features enhance flexibility in defining reactive properties.

New Features for Property Generation:

• Added support for required partial properties in InternalTestViewModel, allowing developers to define required properties with the [Reactive] attribute.

Source Generator Enhancements:

• Updated ReactiveGenerator.Execute.cs to use propertySymbol.IsRequired for determining if a property is required, replacing the previous approach of relying on attribute arguments. This ensures better alignment with C# language features.
• Adjusted property syntax generation in ReactiveGenerator.Execute.cs to reorder modifiers for consistency, placing UseRequired before partialModifier.

What might this PR break?

Previous releases would have failed to compile, therefore no expected changes

Please check if the PR fulfills these requirements

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Other information:

[github-actions]

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