proto: add type stubs for generate schema

setup.py

@@ -28,6 +28,7 @@ requirements = [
     "dnfile==0.13.0",
     "dncil==1.0.2",
     "pydantic==1.10.4",
+    "protobuf==4.21.12",
 ]
 
 # this sets __version__
@@ -79,6 +80,7 @@ setuptools.setup(
             "psutil==5.9.2",
             "stix2==3.0.1",
             "requests==2.28.0",
+            "mypy-protobuf==3.4.0",
             # type stubs for mypy
             "types-backports==0.1.3",
             "types-colorama==0.4.15",
@@ -87,6 +89,7 @@ setuptools.setup(
             "types-termcolor==1.1.4",
             "types-psutil==5.8.23",
             "types_requests==2.28.1",
+            "types-protobuf 4.21.0.5",
         ],
         "build": [
             "pyinstaller==5.7.0",