Missing `is_conformal` for `Basis` and `Transform2D`

### Godot version

4.3-stable

### godot-cpp version

4.3-stable

### System information

macOS 15.1

### Issue description

Godot Variants **Basis** and **Transform2D** don't expose **is_conformal** method that is present in the `extension_api.json`.

### Steps to reproduce

Trivial

### Minimal reproduction project

Trivial