Move all crates to a top-level crates folder

Co-Authored-By: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/gpui/src/json.rs

@@ -0,0 +1,15 @@
+pub use serde_json::*;
+
+pub trait ToJson {
+    fn to_json(&self) -> Value;
+}
+
+impl<T: ToJson> ToJson for Option<T> {
+    fn to_json(&self) -> Value {
+        if let Some(value) = self.as_ref() {
+            value.to_json()
+        } else {
+            json!(null)
+        }
+    }
+}