Clone GVL without JSON.parse / JSON.stringify

[sevriugin]

We need to avoid using JSON.parse / JSON.stringify when we clone very large object as it's very time consuming

[patmmccann]

As an aside, we've recently experimented with klona library with promising results on a different project

[sevriugin]

@patmmccann should we merge this one ?

[HeinzBaumann]

@patmmccann should we merge this one ?

changes look good to me. I am okay with merging.

[honzalo]

Could this changes be merged?

[sevriugin]

I have rights to merge it, so we we don't have any objections then I can do it