Allow for request to place new buffer to the right

[blackadress]

I love this plugin, so far the only minor inconvenience I had is that the new request displaces the buffer I'm working on and places it to the right, nothing major as I can just swap them but still annoying.

So I've worked on this and so far came up with adding two new options to the config:

local config = {
...
  result_split = {
    horizontal = false,
    in_place = false,
  }
...
}

So as to make this behavior configurable. I'm here asking feedback on the variable naming before I submit my PR, once again great plugin, it saves me a lot of time from day to day :)