Added Flutter IconData class

[omamkaz]

Description

Added: Flutter IconData class to implement custom icons in each control supporting IconValue
IconData -> https://api.flutter.dev/flutter/widgets/IconData-class.html

Building

flutter build [platform] --no-tree-shake-icons

Test Code

import flet as ft


def main(page: ft.Page):
    page.horizontal_alignment = ft.CrossAxisAlignment.CENTER
    page.vertical_alignment = ft.MainAxisAlignment.CENTER

    page.fonts = {
        "codicon": "fonts/codicon.ttf"
    }

    page.add(
        ft.Container(
            content=ft.Icon(
                ft.IconData(
                    0xebd8,
                    "codicon"
                ),
                size=128,
                color=ft.Colors.AMBER
            )
        )
    )

ft.app(target=main)

Type of change

• 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

Screenshots

Additional details

Summary by Sourcery

Add support for custom icons using the new IconData class. This allows developers to specify icons from custom fonts by providing the code point, font family, and other relevant properties. Update all relevant controls and methods to support IconData.

New Features:

• Introduce IconData class to define custom icons from arbitrary fonts.

Tests:

• Updated test code to showcase the usage of IconData.