add windows theme source and platform icon resolvers

crates/theme/Cargo.toml

@@ -13,11 +13,23 @@ toml = "0.8"
 [dev-dependencies]
 gpui = { workspace = true, features = ["test-support"] }
 
-[target.'cfg(target_os = "linux")'.dependencies]
+[target.'cfg(any(target_os = "linux", target_os = "windows"))'.dependencies]
 async-channel = "2"
+
+[target.'cfg(target_os = "linux")'.dependencies]
 notify = "8"
 zbus = "5"
 
+[target.'cfg(target_os = "windows")'.dependencies]
+windows = { version = "0.62", features = [
+    "Foundation",
+    "UI",
+    "UI_ViewManagement",
+    "Win32_Foundation",
+    "Win32_System_Com",
+] }
+windows-registry = "0.6"
+
 [target.'cfg(target_os = "macos")'.dependencies]
 block2 = "0.6"
 objc2 = "0.6"