Add an empty activity to show the new screen record toolbar.

This change focuses on bringing a surface to start iterating the UI. I'll make sure to pass the correct arguments and smooth QS tile -> toolbar transition later.

Flag: com.android.systemui.new_screen_record_toolbar
Bug: 414653299
Test: atest ScreenRecordTileUserActionInteractorTest
Test: atest ScreenRecordTileTest
Test: manual
Change-Id: I302951709cb607c13a0f2059823ff724be3a6325