Screen Capture: Setup basic pre-capture toolbar

Creates a new composable for the pre-capture toolbar containing the
radio button groups and various icons. The toolbar will be hooked up to
the view model and state in later CLs.

Screenshot: http://screen/9gETbx9NY9qHJum.png

Bug: 423070146
Test: Manual
Flag: com.android.systemui.desktop_screen_capture
Change-Id: I916b6aed25b0e629eda9098271cd23a45e8b1aee