BBS Port: Mesh Subdivision (#12150)

Ported from BBS
You can now right-click a part and choose Subdivide Part to apply Loop subdivision with multiple iterations. This is useful for models with low original mesh resolution.

> [!NOTE]
> 1. Only meshes without non-manifold edges are supported.
> 2. Color attributes will be lost after subdivision. We recommend subdividing first, then painting and applying colors.

Not perfect and it can break some features but a nice to have and we can improve it.
https://github.com/user-attachments/assets/33f10e49-f6dc-44d3-8c21-9e12e1fe23dc

Best case scenario a sphere:
Each picture is a Mesh subdivision step over the other
<img width="541" height="495" alt="260202_164257_orca-slicer" src="https://github.com/user-attachments/assets/e62b3f4d-ee6b-4451-95a4-40a154d3a405" />
<img width="541" height="495" alt="260202_164302_%pn" src="https://github.com/user-attachments/assets/f7399457-be8d-45e7-b93f-f42064dadd64" />
<img width="541" height="495" alt="260202_164306_%pn" src="https://github.com/user-attachments/assets/55370035-219f-4b7f-94f4-9b31733820d6" />
<img width="541" height="495" alt="260202_164310_%pn" src="https://github.com/user-attachments/assets/3be8c904-cc6f-4efe-b4f8-f390b50d310c" />

deps_src/libigl/igl/loop.h

@@ -29,7 +29,7 @@ namespace igl
     typename DerivedF,
     typename SType,
     typename DerivedNF>
-  IGL_INLINE void loop(
+  IGL_INLINE bool loop(
     const int n_verts,
     const Eigen::PlainObjectBase<DerivedF> & F,
     Eigen::SparseMatrix<SType>& S,
@@ -44,11 +44,11 @@ namespace igl
   //  NV a matrix containing the new vertices
   //  NF a matrix containing the new faces
   template <
-    typename DerivedV, 
+    typename DerivedV,
     typename DerivedF,
     typename DerivedNV,
     typename DerivedNF>
-  IGL_INLINE void loop(
+  IGL_INLINE bool loop(
     const Eigen::PlainObjectBase<DerivedV>& V,
     const Eigen::PlainObjectBase<DerivedF>& F,
     Eigen::PlainObjectBase<DerivedNV>& NV,