[mypy] Enable backends/transforms

Author: digantdesai

.lintrunner.toml

@@ -341,6 +341,7 @@ include_patterns = [
     # 'backends/**/*.py',
     'backends/arm/**/*.py',
     'backends/openvino/**/*.py',
+    'backends/transforms/**/*.py',
     'build/**/*.py',
     'codegen/**/*.py',
     # 'devtools/**/*.py',