Missing is_conformal for Basis and Transform2D

[SebMenozzi]

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

[dsnopek]

We also appear to be missing is_orthonormal().

It's probably time to re-sync those classes with Godot, similar to what we recently did with Quaternion in PR #1630