CupertinoButton Control

[ndonkoHenri]

Closes #2377

Test code:

import flet as ft


def main(page: ft.Page):
    page.theme_mode = ft.ThemeMode.LIGHT
    page.window_always_on_top = True

    page.add(
        ft.CupertinoButton(
            on_click=lambda e: print("CupertinoButton clicked!"),
            alignment=ft.alignment.top_left,
            content=ft.Text("Test", color=ft.colors.YELLOW),
            bgcolor=ft.cupertino_colors.SECONDARY_LABEL,
            border_radius=ft.border_radius.all(15),
            opacity_on_click=None,
            filled=True
        ),
        ft.ElevatedButton(
            width=200,
            bgcolor=ft.cupertino_colors.ACTIVE_ORANGE,
            adaptive=True,
            content=ft.Row(
                [
                    ft.Icon(name=ft.icons.FAVORITE, color="pink"),
                    ft.Icon(name=ft.icons.AUDIOTRACK, color="green"),
                    ft.Icon(name=ft.icons.BEACH_ACCESS, color="blue"),
                ],
                alignment=ft.MainAxisAlignment.SPACE_AROUND,
            ),
        )
    )


ft.app(target=main)