Add drop-down indicator styles support for megamenu

Prerequisites

• I have searched for similar features requests in both open and closed tickets and cannot find a duplicate.
• The feature is still missing in the latest stable version of Elementor ( Elementor Pro )

What problem is your feature request going to solve? Please describe.

I've tried modifying every style to get the dropdown indicator to change size, color, or spacing between the indicator and the text.

Steps to reproduce

Drag the new "Menu" onto a container.
Toggle the first menu item "Dropdown Content" to "On".
Go to the styles window and try to modify the Dropdown Indicator styles. You'll find that there aren't any styles for this feature.

Describe the solution you'd like

It would be nice if there could be styles for the drop-down indicator on the new megamenu.

Describe alternatives you've considered

_No response_

Additional context

_No response_