[terra-menu] allow for custom icons to be display in the menu

[kschuste]

Feature Request

Description

Allow for custom icons to be given to the menu to be displayed to the left of the text. We want the ability to show warning icons in the menu to signify to users that they need to address something that is not currently being displayed to them.

Additional Context / Scre

enshots

@ Mentions

@benbcai

[kschuste]

@neilpfeiffer any updates on this?

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