Add support for Android TV platform in permission handler

[bl1nch]

Description

The underlying flutter_permission_handler package does not officially list Android TV as a supported platform. However, in practice it works reliably on many Android TV builds, since Android TV is fundamentally a variant of the Android platform and shares the same permission APIs.
Currently, Flet's PermissionHandler blocks this platform outright via a hardcoded check. This prevents developers from using the control on Android TV even when it works fine for their use case.

Test code

# Minimal test/reproduction code for reviewers, if applicable.

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.
• I have performed a self-review of my own code.
• My code follows the style guidelines of this project.
• 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 documentation changes, if applicable.
• I have added changelog entries for user-facing changes, if applicable.
• I have updated release guide pages and website/sidebars.yml for breaking changes, removals, and deprecations, if applicable.

Screenshots

Additional details

Summary by Sourcery

Bug Fixes:

• Remove the hardcoded platform restriction that prevented using the permission handler on Android TV.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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[ndonkoHenri]

Can you please update the changelog of that extension?