This is a helper to call a templated function with an integer argument,
based on Dtype.  As a second argument, it takes a suffix, used to build
a unique type name.  This way, we can use it to call a function with
more than one integer argument.

Example:

DISPATCH_INT_DTYPE_PREFIX_TO_TEMPLATE(core::Dtype::Int32, int32, [&]() {
    DISPATCH_INT_DTYPE_PREFIX_TO_TEMPLATE(core::Dtype::UInt64, uint64, [&]() {
    scalar_int32_t a;
    scalar_uint64_t b;
    // ...
});

The method takes a list of indices and returns a new mesh built with
the selected vertices and triangles formed by these vertices.
The indices type can be any integral type.  The algorithm is implemented
on CPU only.

The implementation is inspired by
  open3d::geometry::TriangleMesh::SelectByIndex.
and by
  open3d::t::geometry::TriangleMesh::SelectFacesByMask.

We first compute a mask of vertices to be selected.  If the input index
exceeds the maximum number of vertices or is negative, we ignore the
index and print a warning.

If the mesh has triangles, we build  tringle mask and select needed
triangles.

The next step is to update triangle indices to a new ones.  It is similar
to SelectFacesByMask, so I introduced a static helper to do that.  Based on
the vertex mask we build a mapping index vector using inclusive prefix sum
algorithm and use it as a map between old and new indices.

We select the vertices by mask and build the resulting mesh from the selected
vertices and triangles.

Copying the mesh attributes is again similar to SelectFacesByMask, so I put
it to a separate static function.

* Add error handling on empty mesh
* Use DISPATCH_INT_DTYPE_PREFIX_TO_TEMPLATE instead of a conditional
  branch
* Use UpdateTriangleIndicesByVertexMask helper to update triangle
  indices
* Use CopyAttributesByMask helper to copy the mesh attributes
* Add tests