[Enhancement] Add download rate limiting to app settings (#646)

* Added rate limit column to settings

* Added limit_rate option to command runner

* Added rate limit to settings form

lib/pinchflat/yt_dlp/command_runner.ex

@@ -35,7 +35,7 @@ defmodule Pinchflat.YtDlp.CommandRunner do
 
     output_filepath = generate_output_filepath(addl_opts)
     print_to_file_opts = [{:print_to_file, output_template}, output_filepath]
-    user_configured_opts = cookie_file_options(addl_opts) ++ sleep_interval_opts(addl_opts)
+    user_configured_opts = cookie_file_options(addl_opts) ++ rate_limit_opts(addl_opts)
     # These must stay in exactly this order, hence why I'm giving it its own variable.
     all_opts = command_opts ++ print_to_file_opts ++ user_configured_opts ++ global_options()
     formatted_command_opts = [url] ++ CliUtils.parse_options(all_opts)
@@ -116,6 +116,14 @@ defmodule Pinchflat.YtDlp.CommandRunner do
     end
   end
 
+  defp rate_limit_opts(addl_opts) do
+    throughput_limit = Settings.get!(:download_throughput_limit)
+    sleep_interval_opts = sleep_interval_opts(addl_opts)
+    throughput_option = if throughput_limit, do: [limit_rate: throughput_limit], else: []
+
+    throughput_option ++ sleep_interval_opts
+  end
+
   defp sleep_interval_opts(addl_opts) do
     sleep_interval = Settings.get!(:extractor_sleep_interval_seconds)