feat: add AST checker engine framework with 9 Phase 1 engines

ast_checker/engines/__init__.py

@@ -0,0 +1,21 @@
+from .function_call import CountFunctionCallEngine, MustCallFunctionEngine, MustNotCallFunctionEngine
+from .method_call import MustCallMethodEngine, MustNotCallMethodEngine
+from .node_count import CountNodeEngine
+from .node_exists import MustExistNodeEngine, MustNotExistNodeEngine
+from .operator import MustUseOperatorEngine
+
+ENGINES = {
+    "must_exist_node": MustExistNodeEngine(),
+    "must_not_exist_node": MustNotExistNodeEngine(),
+    "count_node": CountNodeEngine(),
+    "must_call_function": MustCallFunctionEngine(),
+    "must_not_call_function": MustNotCallFunctionEngine(),
+    "count_function_call": CountFunctionCallEngine(),
+    "must_call_method": MustCallMethodEngine(),
+    "must_not_call_method": MustNotCallMethodEngine(),
+    "must_use_operator": MustUseOperatorEngine(),
+}
+
+
+def get_engine(name: str):
+    return ENGINES.get(name)