feat: allow user to provide border option

[mikesmithgh]

I am currently using the compact view and would like to disable borders. I achieved this by modiying https://github.com/rcarriga/nvim-notify/blob/master/lua/notify/stages/fade_in_slide_out.lua#L18 to border = "none", Here a screenshot:

This is a feature request to let the user configure border options. Thanks!

[rcarriga]

I'd rather avoid configs like this because they require making identical changes to each of the stages. However the stages are designed to be easily customised. I've actually been using something very similar myself

  local stages = require("notify.stages.slide")("top_down")
  local notify = require("notify")

  notify.setup({
    render = "compact",
    stages = {
      function(...)
        local opts = stages[1](...)
        if opts then
          opts.border = "none"
        end
        return opts
      end,
      unpack(stages, 2),
    },
    ...
  })

[mikesmithgh]

This worked perfectly. Thanks! Below is the config I went with.

return {
  'rcarriga/nvim-notify',
  enabled = true,
  config = function()
    local stages = require("notify.stages.slide")("top_down")
    local notify = require("notify")

    notify.setup({
      render = "compact",
      stages = {
        function(...)
          local opts = stages[1](...)
          if opts then
            opts.border = "none"
            opts.row = opts.row + 1
          end
          return opts
        end,
        unpack(stages, 2),
      },
      timeout = 2000,
    })
  end
}

https://user-images.githubusercontent.com/10135646/222729521-079b9c54-6e7a-437f-9d99-91dfa1d5c93b.mov

Learned about variable arguments in Lua too 🙂