HDRenderPipeline: Change distortion map to be 0..1 (to support LDR format)

SampleScenes/HDTest/GraphicTest/Common/CustomTexture/DistortionMap.shader

-Shader "Hidden/HDRenderPipeline/Test/DistortionMap"{
+Shader "Hidden/HDRenderPipeline/Test/DistortionMap"{
     Properties
     {
         _Size("Size", Float) = 1
                 float2 distortion = s.xy * _DistortionAmplitude;
                 float blur = s.z;
 
-                return float4(distortion, blur, 1.0);
+                return float4(distortion * 0.5 + 0.5, blur, 1.0);
             }
             ENDCG
         }
                 
                 float blur = (min(t, 1-t) * 2);
 
-                return float4(distortion, blur, 1.0);
+                return float4(distortion * 0.5 + 0.5, blur, 1.0);
             }
             ENDCG
         }
 
                 float blur = v;
 
-                return float4(distortion, blur, 1.0);
+                return float4(distortion * 0.5 + 0.5, blur, 1.0);
-}
+}

ScriptableRenderPipeline/HDRenderPipeline/Material/Lit/LitData.hlsl

     builtinData.velocity = float2(0.0, 0.0);
 
 #if (SHADERPASS == SHADERPASS_DISTORTION) || defined(DEBUG_DISPLAY)
-    float3 distortion = SAMPLE_TEXTURE2D(_DistortionVectorMap, sampler_DistortionVectorMap, input.texCoord0).rgb;
+    float3 distortion = SAMPLE_TEXTURE2D(_DistortionVectorMap, sampler_DistortionVectorMap, input.texCoord0).rgb * 2.0 - 1.0;
     builtinData.distortion = distortion.rg * _DistortionScale;
     builtinData.distortionBlur = clamp(distortion.b * _DistortionBlurScale, 0.0, 1.0) * (_DistortionBlurRemapMax - _DistortionBlurRemapMin) + _DistortionBlurRemapMin;
 #else

ScriptableRenderPipeline/HDRenderPipeline/Material/Unlit/UnlitData.hlsl

     builtinData.velocity = float2(0.0, 0.0);
 
 #if (SHADERPASS == SHADERPASS_DISTORTION) || defined(DEBUG_DISPLAY)
-    float3 distortion = SAMPLE_TEXTURE2D(_DistortionVectorMap, sampler_DistortionVectorMap, input.texCoord0).rgb;
+    float3 distortion = SAMPLE_TEXTURE2D(_DistortionVectorMap, sampler_DistortionVectorMap, input.texCoord0).rgb * 2.0 - 1.0;
     builtinData.distortion = distortion.rg * _DistortionScale;
     builtinData.distortionBlur = clamp(distortion.b * _DistortionBlurScale, 0.0, 1.0) * (_DistortionBlurRemapMax - _DistortionBlurRemapMin) + _DistortionBlurRemapMin;
 #else