Type out snap items for libtw2 json

scripts/generate_messages.py

@@ -88,12 +88,23 @@ class NetConnlessJson(TypedDict):
     name: list[str]
     members: list[NetConnlessMemberJson]
 
+class SnapObjMemberJson(TypedDict):
+    name: list[str]
+    type: NetMessageMemberTypeJson
+
+class SnapObjJson(TypedDict):
+    id: int
+    name: list[str]
+    members: list[SnapObjMemberJson]
+    attributes: list[str]
+
 class SpecJson(TypedDict):
     constants: list[ConstantJson]
     game_enumerations: list[GameEnumJson]
     game_messages: list[NetMessageJson]
     system_messages: list[NetMessageJson]
     connless_messages: list[NetConnlessJson]
+    snapshot_objects: list[SnapObjJson]
 
 def gen_match_file_connless7(
         messages: list[NetConnlessJson]