Support Cupertino Icons and Colors

[ndonkoHenri]

Closes #2430 and #2429

Test Code:

import flet as ft


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

    page.add(
        ft.ElevatedButton("Material", icon=ft.icons.ACCESSIBILITY, icon_color=ft.colors.YELLOW, color=ft.colors.SECONDARY, bgcolor=ft.colors.BLUE_200),
        ft.ElevatedButton("Cupertino", icon=ft.cupertino_icons.ALARM, icon_color=ft.cupertino_colors.DESTRUCTIVE_RED, color=ft.cupertino_colors.SECONDARY_LABEL, bgcolor=ft.cupertino_colors.TERTIARY_SYSTEM_FILL),
    )


ft.app(target=main)