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Fix shader-slang/slang-rhi#762: don't request STORAGE usage for SRGB swapchains (#765)

The Vulkan backend auto-added UnorderedAccess to the default swapchain usage
whenever the chosen format reported ShaderUavStore, which maps to
VK_IMAGE_USAGE_STORAGE_BIT. For SRGB swapchain formats that a driver does not
allow as storage images, vkCreateSwapchainKHR then fails with
VUID-VkSwapchainCreateInfoKHR-imageFormat-01778 (reported on AMD Radeon 9070XT).

- configure(): stop auto-adding UnorderedAccess to the default swapchain usage.
  Apps that need storage on the swapchain must request it explicitly, which the
  existing else-branch already validates against the format.
- createSwapchain(): clamp the requested imageUsage against
  VkSurfaceCapabilitiesKHR::supportedUsageFlags (the caps were queried then
  discarded), as defense-in-depth.
- init(): advertise UnorderedAccess in m_info.supportedUsage only when the
  preferred format reports ShaderUavStore, instead of unconditionally.

Co-authored-by: nv-slang-bot[bot] <274397474+nv-slang-bot[bot]@users.noreply.github.com>
Co-authored-by: Harsh Aggarwal <haaggarwal@nvidia.com>

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