Add python bindings for Mesh optimization feature

[scpeters]

Description

• Expected behavior: all new APIs should have python bindings
• Actual behavior: the mesh optimization feature added in #1382 and #1386 did not include python bindings

Description of done

Add python bindings for mesh optimization to Harmonic and Ionic

[scpeters]

actually this was already done in #1398

thanks @ahcorde!