Add Initial SearchUIManager

Bug:162234997

Test: builds, locally ran cts tests

CTS tests: ag/13129468

[Meeting notes with Svet/Sunny/Winson] go/aaplus-search-api
[Design diagrams] go/aaplus-search-supl

Change-Id: I4589cd411e124dc9d7ea132a71651f6b9f9656ae