refactor: fix the type of glTF

[emadurandal]

┆Issue is synchronized with this Wrike Item

[KaYaF]

We will solve this issue by the following steps:

1. Add a type file of GlTF1 (GlTF1.ts)
2. Add a type file of GlTF2 (GlTF2.ts)
3. Add a type file for the Rhodonite extension to GlTF (RnM.ts)
4. Move the referred type file from GlTF.ts to GlTF1.ts, GlTF2.ts, and RnM.ts
5. Remove GlTF.ts

[emadurandal]

Already Done