[Editor] Add missing virtual bind to EditorNode3DGizmo(Plugin)

[AThousandShips]

Method _begin_handle_action was not bound

• Fixes: Virtual function EditorNode3DGizmoPlugin::begin_handle_action not registered to ClassDB #86880

[AThousandShips]

Would appreciate any details on what this should do, as I don't know what it does, the base method isn't exposed so no information is available

[akien-mga]

CC @KoBeWi who added this AFAICT.

[KoBeWi]

It was added in #71092
It's called when a user clicks the gizmo and can be used to fetch and store initial values.

[AThousandShips]

There are potentially a few other missing binds across the engine, did a casual search, this one turned up:

godot/scene/resources/primitive_meshes.h

Line 626 in 89cc635

GDVIRTUAL2RC(TypedArray<Vector3i>, _structured_text_parser, Array, String)

Will see about another improvement to bind them (that one should probably also be moved into the protected scope)

[dsnopek]

I don't know the specifics of this particular node, but looking at the code, it's clear that these methods were intended to be exposed to GDExtension (it's got the GDVIRTUAL*() and GDVIRTUAL_CALL()) but that the GDVIRTUAL_BIND() was just forgotten.

So, I can't help with the docs, but the functional code looks good!

[akien-mga]

Thanks!

[AThousandShips]

Thank you!

[akien-mga]

Cherry-picked for 4.2.2.