Add seekbar to Voicemail Media Player

Adds the UX support for showing the seekbar in the NUI Media player. It also shows a starting and total duration text as well, though as of right now it's a static value and will be updated in a follow up CL.

Bug: 64882313,68382421,69268144
Test: Unit tests
PiperOrigin-RevId: 175595293
Change-Id: I14440599d52352c213c7513dd2d0a8aef2f51bfe