Sort extension constants in output

[bbredesen]

Extension names and spec versions are coming out in an undefined order, which causes them to be listed in that order on pkg.go.dev. Sort the constants after they come out of the map, so that related extension name and spec versions are next to each other in the output. This is already being done for enumerated values, command names, etc.

Current output:

QCOM_IMAGE_PROCESSING_SPEC_VERSION                       = 1
EXT_ATTACHMENT_FEEDBACK_LOOP_LAYOUT_SPEC_VERSION         = 2
EXT_DISPLAY_SURFACE_COUNTER_EXTENSION_NAME               = "VK_EXT_display_surface_counter"
NV_DEVICE_GENERATED_COMMANDS_SPEC_VERSION                = 3
KHR_RAY_QUERY_SPEC_VERSION                               = 1
EXT_GRAPHICS_PIPELINE_LIBRARY_EXTENSION_NAME             = "VK_EXT_graphics_pipeline_library"
// ...

Desired output:

EXT_DISPLAY_SURFACE_COUNTER_EXTENSION_NAME               = "VK_EXT_display_surface_counter"
EXT_DISPLAY_SURFACE_COUNTER_SPEC_VERSION                 = 1
// etc...

[bbredesen]

Included in this is an update to typed extension const values too, sorting those by the value.

const (
	STRUCTURE_TYPE_EXPORT_FENCE_WIN32_HANDLE_INFO_KHR             StructureType = 1000114001
	STRUCTURE_TYPE_EXPORT_SEMAPHORE_WIN32_HANDLE_INFO_KHR         StructureType = 1000078001
	STRUCTURE_TYPE_IMPORT_SEMAPHORE_WIN32_HANDLE_INFO_KHR         StructureType = 1000078000
)

Becomes:

const (
	STRUCTURE_TYPE_EXPORT_FENCE_WIN32_HANDLE_INFO_KHR             StructureType = 1000114001
	STRUCTURE_TYPE_IMPORT_SEMAPHORE_WIN32_HANDLE_INFO_KHR         StructureType = 1000078000
	STRUCTURE_TYPE_EXPORT_SEMAPHORE_WIN32_HANDLE_INFO_KHR         StructureType = 1000078001
)