Fixed float value to string error and truncation warning for normal create node

ShaderGraph/com.unity.shadergraph/Editor/Data/Graphs/ColorMaterialSlot.cs

         {
             return string.Format("IsGammaSpace() ? {0}4({1}, {2}, {3}, {4}) : {0}4 (SRGBToLinear({0}3({1}, {2}, {3})), {4})"
                 , precision
-                , value.x
-                , value.y
-                , value.z
-                , value.w);
+                , NodeUtils.FloatToShaderValue(value.x)
+                , NodeUtils.FloatToShaderValue(value.y)
+                , NodeUtils.FloatToShaderValue(value.z)
+                , NodeUtils.FloatToShaderValue(value.w));
         }
 
         public override void AddDefaultProperty(PropertyCollector properties, GenerationMode generationMode)

ShaderGraph/com.unity.shadergraph/Editor/Data/Graphs/ColorRGBMaterialSlot.cs

         {
             return string.Format("IsGammaSpace() ? {0}3({1}, {2}, {3}) : SRGBToLinear({0}3({1}, {2}, {3}))"
                 , precision
-                , value.x
-                , value.y
-                , value.z);
+                , NodeUtils.FloatToShaderValue(value.x)
+                , NodeUtils.FloatToShaderValue(value.y)
+                , NodeUtils.FloatToShaderValue(value.z));
         }
 
         public override void AddDefaultProperty(PropertyCollector properties, GenerationMode generationMode)

ShaderGraph/com.unity.shadergraph/Editor/Data/Nodes/Artistic/Normal/NormalCreateNode.cs

                 sb.AppendLine("{0}2 offsetU = float2(UV.x + Offset, UV.y);", precision);
                 sb.AppendLine("{0}2 offsetV = float2(UV.x, UV.y + Offset);", precision);
 
-                sb.AppendLine("{0} normalSample = Texture.Sample(Sampler, UV);", precision);
-                sb.AppendLine("{0} uSample = Texture.Sample(Sampler, offsetU);", precision);
-                sb.AppendLine("{0} vSample = Texture.Sample(Sampler, offsetV);", precision);
+                sb.AppendLine("{0} normalSample = Texture.Sample(Sampler, UV).x;", precision);
+                sb.AppendLine("{0} uSample = Texture.Sample(Sampler, offsetU).x;", precision);
+                sb.AppendLine("{0} vSample = Texture.Sample(Sampler, offsetV).x;", precision);
 
                 sb.AppendLine("{0}3 va = float3(1, 0, (uSample - normalSample) * Strength);", precision);
                 sb.AppendLine("{0}3 vb = float3(0, 1, (vSample - normalSample) * Strength);", precision);

ShaderGraph/com.unity.shadergraph/Editor/Data/Nodes/Input/Basic/ColorNode.cs

                 @"{0}4 {1} = IsGammaSpace() ? {0}4({2}, {3}, {4}, {5}) : {0}4(SRGBToLinear({0}3({2}, {3}, {4})), {5});"
                 , precision
                 , GetVariableNameForNode()
-                , color.color.r
-                , color.color.g
-                , color.color.b
-                , color.color.a), true);
+                , NodeUtils.FloatToShaderValue(color.color.r)
+                , NodeUtils.FloatToShaderValue(color.color.g)
+                , NodeUtils.FloatToShaderValue(color.color.b)
+                , NodeUtils.FloatToShaderValue(color.color.a)), true);
         }
 
         public override string GetVariableNameForSlot(int slotId)