linux: Better GPU debugging (#14706)

Release Notes:

- linux: Added GPU information to `editor: Copy System Specs to
Clipboard`
- linux: Show a prominant warning before running under llvmpipe and
similar.

crates/gpui/src/gpui.rs

@@ -341,3 +341,16 @@ impl<T> Flatten<T> for Result<T> {
         self
     }
 }
+
+#[derive(Default, Debug)]
+/// Information about the GPU GPUI is running on
+pub struct GPUSpecs {
+    /// true if the GPU is really a fake (like llvmpipe) running on the CPU
+    pub is_software_emulated: bool,
+    /// Name of the device as reported by vulkan
+    pub device_name: String,
+    /// Name of the driver as reported by vulkan
+    pub driver_name: String,
+    /// Further driver info as reported by vulkan
+    pub driver_info: String,
+}