Feature: Option to override bufnew

[kevintraver]

Currently, the behavior of bufnew is managed by configuration settings. This enhancement introduces the ability to override this configuration, enabling the creation of distinct keymaps for controlling bufnew.

-- keymap for splitting without bufnew
keymap('n', '<c-l>', function()
    require('focus').split_nicely("", false)
end, { desc = 'split nicely' })

-- keymap for splitting with bufnew
keymap('n', '<c-s-l>', function()
    require('focus').split_nicely("", true)
end, { desc = 'split nicely (bufnew)' })

[cryptomilk]

Thank you very much for your contribution.

If we add this we should use an opts parameter passed to the function.

opts = {
  args = '',
  bufnew = true,
}

It would then look like this:

require('focus').split_nicely({ bufnew = true })

You could also make it backwards compatible by checking if the parameter is a string or table this way!

Also this would need to be backed by tests.