add SVGO implementation to optimize and clean SVGs

[Neoniq]

https://github.com/svg/svgo

There are nuxt modules with support for SVGO but they are not working out of the box with nuxt/icon (or not working at all like https://nuxt.com/modules/svg-sprite)

So i think it is good addition to already most perfect module

I myself find it frustrating to fix fill and stroke to be of currentColor. SVGO can do it for me just fine