Export participants to different formats

* CSV
* PDF (requires Python dependency `weasyprint`)
* ODS (requires Python dependency `pyexcel_ods3`)

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/service/workers/export_cleaner_worker.ex

@@ -0,0 +1,14 @@
+defmodule Mobilizon.Service.Workers.ExportCleanerWorker do
+  @moduledoc """
+  Worker to clean exports
+  """
+
+  use Oban.Worker, queue: "background"
+  import Mobilizon.Service.Export.Participants.Common, only: [export_modules: 0]
+
+  @impl Oban.Worker
+  @spec perform(Oban.Job.t()) :: :ok
+  def perform(%Job{}) do
+    Enum.each(export_modules(), & &1.clean_exports())
+  end
+end