[Feature] Ability to interact with RadioButton elements

[jamesmcroft]

Describe the feature and how it will be used

Introduce the ability to interact with the Uno Platform RadioButton element.

There should be properties for whether a button is selected, as well as an action for selecting the option.

Platforms

• iOS
• Android
• WebAssembly

[ShivamMissar]

Hi, am I okay to take a quick stab at this?