Add "zv" to recursively open folds until the current line

[jlombera]

I am new to Emacs (migrating from Vim => Spacemacs) and would really like to have Vim's behavior of "zv". From Vim's doc, "zv" is described as:

View cursor line: Open just enough folds to make the line in which the cursor is located not folded.

[alexmurray]

As vimish-fold does not support recursive folds this will have to wait until it does then we can add support for it here - matsievskiysv/vimish-fold#17