Curve.add_point has changed and has no compatibility function

### Godot version

https://github.com/godotengine/godot/tree/4ab8fb809396fa38ba929fec97cfcb7193f1c44d

### godot-cpp version

https://github.com/godotengine/godot-cpp/tree/99926d8e2027f6bfdc66e341a1c735b20eda61e4

### System information

Windows 11, Nvidia 3090, Vulkan forward+

### Issue description

We are trying to upgrade to 4.3 and loading with godot double precision crashes when using the gdextension.

https://github.com/Vahera/godot-orchestrator/pull/450

Also, I noticed that execution of the game doesn't crash, but the editor does.

### Steps to reproduce

1. compile godot engine precision=double
2. load project
3. load gdextension for orchestrator
4. open a orchestration file


### Minimal reproduction project

[godot-orchestrator-demo-windows-release(3).zip](https://github.com/user-attachments/files/16042635/godot-orchestrator-demo-windows-release.3.zip)