[Le Audio] Add a new BroadcastDialog in SystemUI from MediaPanel

Figma: https://screenshot.googleplex.com/cxMh67ua33Zc9W9.png
Screenshot: https://hsv.googleplex.com/5949719982374912
Screenshot: https://hsv.googleplex.com/5356807666008064

Bug: 228415131
Test: manual, atest MediaControlPanelTest, atest MediaDeviceManagerTest
Change-Id: Ic2984aa0caee299ce405d5581c9c063656e7b296