[sf] Implement addSamplingListener
Implements ISurfaceComposer::addSamplingListener, which allows a client to receive streaming median luma updates for a given region of the screen. Bug: 119639245 Test: Manual using SamplingDemo in libgui Test: Automated libgui_test in Ic85a97f475a3414a79d3719bbd0b2b648bbccfb0 Change-Id: Ic52359aeab884e734a806372be0eb4e327c45298
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