feat(command-modifiers): add command-modifiers to the toggle() and open() APIs

[serranomorante]

With this PR, now one could do:

require("quicker").toggle({ open_cmd_mods = { split = "botright" } })
require("quicker").open({ open_cmd_mods = { split = "botright" } })

An alternative to this PR is using the following autocmd.

local init = function()
  vim.api.nvim_create_autocmd("FileType", {
    desc = "Open quickfix list globally",
    group = vim.api.nvim_create_augroup("quickfix_toggle", { clear = true }),
    pattern = "qf",
    command = "wincmd J",
  })
end

[stevearc]

One of the things that's confusing about this is that if you pass in the open_cmd the loclist parameter is partially ignored. What do you think about instead passing in open_cmd_mods which is a table of the modifiers that can be passed to the command (see :help nvim_parse_cmd)? There's already a type defined for this table.

[serranomorante]

Thanks for looking at it! I did the changes and updated the description 👍

[stevearc]

LGTM thanks for the PR!