Add stubs for pyimgui - Dear ImGui bindings

stubs/imgui/METADATA.toml

@@ -0,0 +1,3 @@
+version = "2.0.0"
+upstream_repository = "https://github.com/pyimgui/pyimgui"
+requires_python = ">=3.12"

stubs/imgui/imgui/__init__.pyi

@@ -0,0 +1,11 @@
+from typing import Final
+
+from imgui.core import *
+from imgui.extra import *
+
+VERTEX_BUFFER_POS_OFFSET: Final[int]
+VERTEX_BUFFER_UV_OFFSET: Final[int]
+VERTEX_BUFFER_COL_OFFSET: Final[int]
+
+VERTEX_SIZE: Final[int]
+INDEX_SIZE: Final[int]