implements meshoptimizer -sv

[Makio64]

The support of -sv will improve a lot the model simplification especially for model without textures.

Commit : https://github.com/zeux/meshoptimizer/pull/688

Issue: https://github.com/zeux/meshoptimizer/issues/652

[donmccurdy]

Agreed that this will be helpful! Merging the issue into:

• https://github.com/donmccurdy/glTF-Transform/issues/1153
• https://github.com/donmccurdy/glTF-Transform/issues/1335