refactor: move remaining language examples to fixture files

tests/fixtures/languages/ocaml/test.ml

@@ -0,0 +1,19 @@
+(* Module definition *)
+module Greeter = struct
+  type person = {
+    name: string;
+    age: int
+  }
+
+  let create_person name age =
+    {name; age}
+
+  let greet person =
+    Printf.printf "Hello, %s! You are %d years old.\n"
+      person.name person.age
+end
+
+(* Outside the module *)
+let () =
+  let person = Greeter.create_person "Alice" 30 in
+  Greeter.greet person