[dataset viewer]: add a mesh column so the 3d previews render

Hi @prithivMLmods ! This adds a `mesh` column to `data/train-00000-of-00001.parquet` that points at each row's GLB, so the dataset page gets a 3D Assets gallery and every row an interactive 3D preview. The other columns, including `3d_glb`, are unchanged. Up to you whether you want it!

Preview: https://huggingface.co/datasets/cfahlgren1/OpenSCAD-Code-to-GLB

| Before | After |
|---|---|
|  |  |

README.md

@@ -7,6 +7,8 @@ dataset_info:
     dtype: string
   - name: 3d_glb
     dtype: string
+  - name: mesh
+    dtype: mesh
   splits:
   - name: train
     num_bytes: 18539595

data/train-00000-of-00001.parquet

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:1610c92c0a75f4ed66d951ddff635a9805975205d2bf07333a2d77d43940307e
-size 6184192
+oid sha256:8396b75dbc03e7efded24e1d81c76f683ecf1a9999446e3320441d0e254861a1
+size 6269271