Vulkan Sampler implementation

The Vulkan sampler is simply a state, similar to the existing
sw::Sampler::State(), which will eventually be used by the
texture sampling code.

Bug b/119823006

Change-Id: Ib2f09683f82dbf5b5aacde1555ee850c76cda9e2
Reviewed-on: https://swiftshader-review.googlesource.com/c/22728
Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>

src/Vulkan/vulkan.vcxproj

diff --git a/src/Vulkan/vulkan.vcxproj b/src/Vulkan/vulkan.vcxproj
index 78ebcfa..a9a6383 100644
--- a/src/Vulkan/vulkan.vcxproj
+++ b/src/Vulkan/vulkan.vcxproj
@@ -209,6 +209,7 @@
     <ClInclude Include="VkPipelineLayout.hpp" />

     <ClInclude Include="VkQueue.hpp" />

     <ClInclude Include="VkRenderPass.hpp" />

+    <ClInclude Include="VkSampler.hpp" />

     <ClInclude Include="VkSemaphore.hpp" />

     <ClInclude Include="VkShaderModule.hpp" />

     <ClInclude Include="..\Device\Blitter.hpp" />