Add CSS Class options to Insert Link

[mohdaftab]

Hello,
Thank you so much for creating this awesome plugin to use with Filamentphp.
I have a request to make which is an option to add CSS Classes in the Insert Link settings.
Also if it is possible to use pre-defined classes as they appear in options when we toggle the is Button property as the options there works with TailwindCSS and it is difficult to make it work for Bootstrap or other custom styles.

Thank you so much.