SilkFX: Add example SDR<->HDR animations via gainmap params.

In the gainmap image view, when the image is clicked in an HDR output
mode, animate from HDR to SDR then back again after a short delay on
SDR. The animation is done by animating minDisplayRatioForHdrTransition
between its original value and the value of displayRatioForFullHdr.

Bug: 292241206
Test: manully confirmed new click behavior and output mode switching
Change-Id: I77038330f9cfc03a3071342244923a3861c0fb6a