Add an option to change shadow render distance for VV.

With the latest minecraft preview version we have the option to set our vibrant visual render distance to 48 chunks, which is great! but the thing for me was not that the render distance wasn't far enough, it's that shadows only render within a shorter distance. When looking at a mountain for example with the sun on the other side, some blocks are darker because there are blocks between the sun and player but higher up just outside the shadow render distance the blocks are completely lit up. In my opinion, it would be amazing if we could change the shadow render distance ourselfs to something we like. So instead of playing with 48 render distance and 10 chunk shadow render distance, I would prefer to play on 24 render distance with 24 shadow render distance.