Possibility to add sebng-loader to sebng-textbox as icon

[vaboliss]

Problem:
I was trying to position sebng-loader on the right of sebng-textbox, and failed to do it.

Describe the solution you'd like
Possibility to pass sebng-loader component for it to be placed as icon in sebng-textbox.

Describe alternatives you've considered
Workaround solution for today is using custom svg which has animations and looks somewhat similar to sebng-loader