CupertinoRadio control and Radio.adaptive

[ndonkoHenri]

Close #2201

Test Code:

import flet as ft


def main(page):
    def button_clicked(e):
        t.value = f"Your favorite color is:  {cg.value}"
        page.update()

    t = ft.Text()
    b = ft.ElevatedButton(text="Submit", on_click=button_clicked)
    cg = ft.RadioGroup(
        content=ft.Column(
            [
                ft.CupertinoRadio(value="red", label="Red - Cupertino Radio", active_color=ft.colors.RED),
                ft.Radio(value="green", label="Green - Material Radio", fill_color=ft.colors.GREEN),
                ft.Radio(value="blue", label="Blue - Adaptive Radio", adaptive=True, active_color=ft.colors.BLUE),
            ]
        )
    )

    page.add(ft.Text("Select your favorite color:"), cg, b, t)


ft.app(target=main)