chore: import upstream snapshot with attribution

dev/proto_to_graphql/string_utils.py

@@ -0,0 +1,14 @@
+import re
+
+
+def camel_to_snake(string):
+    return re.sub(r"(?<!^)(?=[A-Z])", "_", string).lower()
+
+
+def snake_to_camel(string):
+    return "".join(x[0].upper() + x[1:] for x in string.split("_"))
+
+
+def snake_to_pascal(string):
+    temp = snake_to_camel(string)
+    return temp[0].upper() + temp[1:]