[Feature]: per-mode implementations for commands

[mrjones2014]

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Description

I have a command defined like this in my config:

{
  ':Comment',
  function()
    local keys = 'gcc'
    if require('legendary.toolbox').is_visual_mode() then
      keys = 'gc'
    end

    vim.api.nvim_feedkeys(keys, 't', true)
  end,
  description = 'Toggle comment',
}

What I'd like to be able to do is a similar syntax to keymaps:

{
  ':Comment',
  {
    n = 'gc',
    v = 'gcc',
  },
  description = 'Toggle comment',
}