[Shadows] Populate global shadow settings (3/n)

Read framework resources and call the new SurfaceControl#setGlobalShadowSettings
API to set global shadow settings. Some of these settings can be overrided by
apps but for shadows drawn by SurfaceFlinger to be applied on surfaces, as opposed
to app content, we will keep all settings constant.

Bug: 136561771
Test: go/wm-smoke
Change-Id: I6f759479352e6923b883cae67f9b089d82978d30