Add support for MiniMessage Gradients

[ThomasCatlow]

So far, absolutely loving using this plugin over any competitor. It's more packed with features compared to many plugins, even paid ones. The one thing that I'm currently missing is support for gradients.

Considering your current support for MiniMessage, addition of their gradients would make the plugin even more appealing.

Would love to see this in the future. Thank you for the plugin <3