Rename Camera3D near and far getters and setters

[madmiraal]

As originally identified here, Camera3D's near and far properties' getters and setters don't match the property name.

This PR renames the Camera3D's methods:

• get_znear() -> get_near()
• set_znear() -> set_near()
• get_zfar() -> get_far()
• set_zfar() -> set_far()

Part of #16863.

[madmiraal]

Rebased following merge of #33207.

[akien-mga]

Thanks!

[bruvzg]

Something went wrong.

modules/gltf/gltf_document.cpp:4891:25: error: no member named 'get_zfar' in 'Camera3D'; did you mean 'get_far'?
                c->set_zfar(p_camera->get_zfar());
                                      ^~~~~~~~
                                      get_far
./scene/3d/camera_3d.h:124:8: note: 'get_far' declared here
        float get_far() const;
              ^
modules/gltf/gltf_document.cpp:4892:26: error: no member named 'get_znear' in 'Camera3D'; did you mean 'get_near'?
                c->set_znear(p_camera->get_znear());
                                       ^~~~~~~~~
                                       get_near
./scene/3d/camera_3d.h:125:8: note: 'get_near' declared here
        float get_near() const;
              ^
modules/gltf/gltf_document.cpp:4895:25: error: no member named 'get_zfar' in 'Camera3D'; did you mean 'get_far'?
                c->set_zfar(p_camera->get_zfar());
                                      ^~~~~~~~
                                      get_far
./scene/3d/camera_3d.h:124:8: note: 'get_far' declared here
        float get_far() const;
              ^
modules/gltf/gltf_document.cpp:4896:26: error: no member named 'get_znear' in 'Camera3D'; did you mean 'get_near'?
                c->set_znear(p_camera->get_znear());
                                       ^~~~~~~~~
                                       get_near
./scene/3d/camera_3d.h:125:8: note: 'get_near' declared here
        float get_near() const;

[madmiraal]

For the record: Should have been rebased after merging #34193. Fixed with #44758.