Use '<shift-k>' as default hover mapping

Is your feature request related to a problem? Please describe. Vscodevim default gh mapping to hover doesn't make sense. In both vim and neovim K is used as keywordprg.

Describe the solution you'd like Change plugin default to have K perform hover

Describe alternatives you've considered I can add the setting myself

    {
      "before": [
        "K"
      ],
      "commands": [
        "editor.action.showHover"
      ]
    },

But this makes no sense to not include this by default. When both nvim and vim support this and K in vsvim does nothing.

Additional context Related https://github.com/VSCodeVim/Vim/issues/9995