gpu: add Adapter.Type

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

gpu/src/Adapter.zig

@@ -1 +1,17 @@
 ptr: *anyopaque,
+
+pub const Type = enum(u32) {
+    discrete_gpu,
+    integrated_gpu,
+    cpu,
+    unknown,
+};
+
+pub fn typeName(t: Type) []const u8 {
+    return switch (t) {
+        .discrete_gpu => "Discrete GPU",
+        .integrated_gpu => "Integrated GPU",
+        .cpu => "CPU",
+        .unknown => "Unknown",
+    };
+}