[SilkFX] The very first version of lut demo app

Relnote: Now only support to play with Lut on the image. We provide the
pre-defined Lut, and users can check the button to see the results.

Bug: 391680040
Test: play with SilkFX
Flag: EXEMPT demo app development

Change-Id: I0f82126c1fd7cbb474e6c619709de641dfa636b5