[Work In Progress][Feature] showLineNumber

[runyasak]

This PR is related to #35

I have created line-number component with style.

However, I can't count the line number because the component is recursive.
If you have any solution or best practice, please tell me and I will resolve it.

For now, I bind it with currentDeep.

Thank you 😁

[nkreiger]

see
https://github.com/leezng/vue-json-pretty/pull/80/files
I extended what you have done (the styling) to work recursively, a little jenky, but maybe we can pick something up from there.