TextField.text_vertical_align property

[ndonkoHenri]

Closes #1242

TestCode:

import flet as ft


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

    page.add(
        ft.TextField(
            value="Hello, World!",
            text_vertical_align=ft.VerticalAlignment.END,
            prefix_icon=ft.icons.EMOJI_EMOTIONS,
        )
    )


ft.app(target=main)