Button control

[InesaFitsner]

Description

Button control as alias to ElevatedButton

Fixes #4253

Test Code

import flet as ft

def main(page: ft.Page):
    page.title = "Basic buttons"
    page.add(
        ft.Button(text="Button"),
        ft.Button("Disabled button", disabled=True),
    )

ft.app(target=main)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I signed the CLA.
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings

• New and existing tests pass locally with my changes
• I have made corresponding changes to the documentation (if applicable)

Screenshots (if applicable):

Additional details