Add vulkan validation features for debugPrintfEXT, shader source debugging

[briansemrau]

To debug unusual issues within compute shaders in a project, I had to enable some vulkan features for debugPrintfEXT and shader source debugging in RenderDoc.

This enables you to add this to your shaders:

#extension GL_EXT_debug_printf : enable
// ...
void main() {
    debugPrintfEXT("Running shader!");
}

output:

VALIDATION - Message Id Number: -1841738615 | Message Id Name: UNASSIGNED-DEBUG-PRINTF
        Validation Information: [ UNASSIGNED-DEBUG-PRINTF ] Object 0: handle = 0x145320d9e20, type = VK_OBJECT_TYPE_DEVICE; | MessageID = 0x92394c89 | Running shader!
        Objects - 1
                Object[0] - VK_OBJECT_TYPE_DEVICE, Handle 1396704124448

To enable this feature, use the command line option --gpu-validation-features and enable the debug printf preset in Vulkan Configurator.

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Additionally, this option enables compiling SPIR-V shaders with source strings included for source-level debugging in RenderDoc. (Perhaps this should be a separate option?)

To do this:

1. open project in editor with --gpu-validation-features and make sure shaders are imported
2. put a breakpoint in Main::setup
3. launch the project godot.windows.editor.x86_64.exe --path pathToProj --gpu-validation-features
4. RenderDoc -> Tools -> Settings -> General -> Enable process injection
5. inject into godot
6. resume from breakpoint and debug shaders

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• should probably forward this cli option as per https://github.com/godotengine/godot/blob/46424488edc341b65467ee7fd3ac423e4d49ad34/main/main.cpp#L840C21-L844

[clayjohn]

See #77975 which has a few more tweaks in the glslang module

[briansemrau]

See #77975 which has a few more tweaks in the glslang module

Ah, didn't see that PR. I could trim that out of this PR and just keep debugPrintfEXT