feat(users/Profpatsch/whatcd-resolver): add a simple torrent parser

The `bencode` library is anything but production-grade, but it’s
enough to parse the torrent files generated by Gazelle lol.

This should help with … I haven’t really figured out yet what it helps
with I guess. But it was fun. I like the `Parse` abstraction very
much. It can parse XML and it can parse Bencode. Good.

Change-Id: If1331de423eab3e91ce9db6e2a7eb84da51b18a2
Reviewed-on: https://cl.tvl.fyi/c/depot/+/13211
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>

users/Profpatsch/whatcd-resolver/whatcd-resolver.cabal

@@ -65,6 +65,7 @@ library
     exposed-modules:
        WhatcdResolver
        AppT
+       Bencode
        JsonLd
        Optional
        Http
@@ -84,6 +85,7 @@ library
         pa-run-command,
         aeson-better-errors,
         aeson,
+        bencode,
         blaze-html,
         bytestring,
         case-insensitive,
@@ -108,7 +110,9 @@ library
         postgresql-simple,
         punycode,
         tmp-postgres,
+        time,
         unliftio,
+        selective,
         wai-extra,
         wai,
         warp,