vulkan: use external_semaphore_drm_syncobj if available

[mahkoh]

KhronosGroup/Vulkan-Docs#2692

[Copilot]

Pull request overview

This PR adds support for using VK_EXT_external_semaphore_drm_syncobj for Vulkan timeline semaphore export when available, falling back to opaque FD export otherwise.

Changes:

• Detects DRM syncobj semaphore export support and enables the extension/feature during device creation.
• Adds supports_syncobj_export to Vulkan device abstractions.
• Updates timeline semaphore creation to prefer DRM_SYNCOBJ_EXT handles.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/vulkan_core/timeline_semaphore.rs	Prefers DRM_SYNCOBJ_EXT export for timeline semaphores when supported.
src/vulkan_core/device.rs	Extends the Vulkan device trait with syncobj export capability reporting.
src/vulkan_core.rs	Adds core capability detection for DRM syncobj semaphore export.
src/gfx_apis/vulkan/device.rs	Enables syncobj extension/feature for the main Vulkan renderer.
src/egui_adapter/egui_vulkan.rs	Enables syncobj extension/feature for the egui Vulkan renderer.
src/copy_device.rs	Enables syncobj extension/feature for copy devices.
Cargo.toml	Switches jay-ash to a git branch containing syncobj support.
Cargo.lock	Updates locked jay-ash dependency source/version.

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