fix: `Switch`'s `height` and `width` properties not respected when `label` is set

[ndonkoHenri]

Description

Fixes #3997

Continuation of https://github.com/flet-dev/flet/pull/3670

Test Code

import flet as ft

def main(page: ft.Page):
    page.add(
        ft.Switch(
            label="Switch 50",
            value=True,
            on_change=lambda e: print(e.value),
            height=50,
        ),
        ft.Switch(
            label="Switch 100",
            value=True,
            on_change=lambda e: print(e.value),
            height=100,
            label_position=ft.LabelPosition.LEFT,
        ),
    )

ft.app(target=main)

Summary by Sourcery

Fix the issue where the Switch component's height and width properties were not respected when a label was set, ensuring proper layout and functionality.

Bug Fixes:

• Ensure the Switch component respects the height and width properties when a label is set.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request addresses an issue where the Switch control's height and width properties were not being respected when a label was set. The fix involves restructuring the widget tree to ensure proper sizing and layout of the Switch control with its label.

File-Level Changes

Change	Details	Files
Restructured the widget tree for the Switch control with label	Wrapped the existing Switch and label widgets in a Row with MainAxisSize.min Moved the MergeSemantics widget to encompass the entire Row Adjusted the order of widgets in the Row based on label position	packages/flet/lib/src/controls/switch.dart

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