feat: Add Pony language test case and fixture

tests/basic/test_repomap.py

@@ -311,6 +311,7 @@ class TestRepoMapAllLanguages(unittest.TestCase):
             "arduino": ("ino", "setup"),
             "chatito": ("chatito", "intent"),
             "commonlisp": ("lisp", "greet"),
+            "pony": ("pony", "Greeter"),
         }
 
         fixtures_dir = Path(__file__).parent.parent / "fixtures" / "languages"

tests/fixtures/languages/pony/test.pony

@@ -0,0 +1,8 @@
+class Greeter
+  fun greet(name: String): String =>
+    "Hello, " + name + "!"
+
+actor Main
+  new create(env: Env) =>
+    let greeter = Greeter
+    env.out.print(greeter.greet("Pony"))