* Add HDR color grading pass and shaders.
* Remove color grading pass from light adaptation parent pass due to failing ASV tests. This will be added back later on.
* Editor HDR Color Grading Component implemented under the PostFx stack (#219)
* Add softmin/max for unbounded color grading properties.
* Revert channel mixer properties to vector3. Refactor mix to weight. Fix color grading pass to convert any color variable into vec4.
Signed-off-by: rbarrand <rbarrand@amazon.com>
Co-authored-by: Robin <rbarrand@amazon.com>
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