make timeout value configurable

[pseudozach]

Is your feature request related to a problem? Please describe.
I'm having timeouts while downloading and syncing playlists.

Describe the solution you'd like
timeout should be configurable not hardcoded to 5mins.
app/Jobs/ProcessM3uImport.php at line 630 should be configurable on the UI
->timeout(60 * 5) // set timeout to five minues

Describe alternatives you've considered
working with my IPTV provider so they fix their server so playlist download finishes faster :)