fix: create flame_game doesn't setup project for macos

[wonderkidshihab]

Description
I am trying to create a simple game using the flame engine. I am trying to use very_good create flame_game <game_name> to create the template for me. But it doesn't set up the template for macOS. It sets it up for windows, android, ios, and the web. But not for Linux and macOS.

Steps To Reproduce

1. install very_good_cli on your local machine
2. run very_good create flame_game <game_name> from your terminal in your desired directory.

Expected Behavior
It should have created the project and flavors for all the platforms.

[wolfenrain]

macOS is not supported for any of our templates as we don't have flavor support yet on Flutter stable.

This will change in the near future as they are adding it to the beta channel. You can track flavor support for the CLI templates here: #452