Update: add __iter__ for IDPropertyGroupView classes

[Andrej730]

PR solves issues with an example below:

import bpy

class MyPropertyGroup(bpy.types.PropertyGroup):
    custom_1: bpy.props.FloatProperty(name="My Float")
    custom_2: bpy.props.IntProperty(name="My Int")

bpy.utils.register_class(MyPropertyGroup)

bpy.types.Object.my_prop_grp = bpy.props.PointerProperty(type=MyPropertyGroup)

props: MyPropertyGroup = bpy.data.objects[0].my_prop_grp
props.custom_1 = 22.0
print(a:=list(props.keys()))
print(b:=list(props.values()))
print(c:=list(props.items()))
print(c:=list(props.items()))

Diff for fake bpy modules after PR:

diff --git a/build_files/idprop/types/__init__.pyi b/build_files/idprop/types/__init__.pyi
index 7ab9575..557abce 100644
--- a/build_files/idprop/types/__init__.pyi
+++ b/build_files/idprop/types/__init__.pyi
@@ -55,6 +55,6 @@ class IDPropertyGroup:
 class IDPropertyGroupIterItems: ...
 class IDPropertyGroupIterKeys: ...
 class IDPropertyGroupIterValues: ...
-class IDPropertyGroupViewItems: ...
-class IDPropertyGroupViewKeys: ...
-class IDPropertyGroupViewValues: ...
+class IDPropertyGroupViewItems(collections.abc.Iterable[tuple[str, typing.Any]]): ...
+class IDPropertyGroupViewKeys(collections.abc.Iterable[str]): ...
+class IDPropertyGroupViewValues(collections.abc.Iterable[typing.Any]): ...

[nutti]

Thank you.