feat(users/Profpatsch/whatcd-resolver): conduitToHtmx w/ counter ex

Experiment: can we convert any Html-producing conduit into a
self-updating htmx snippet? Yes!

Add the resulting handler and initial snippet, and it will poll the
handler every second or so until the conduit stops emitting values.

Change-Id: I0bed17a5db8691a19df6c334ae1268dd6a3d3123
Reviewed-on: https://cl.tvl.fyi/c/depot/+/13209
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>

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

@@ -87,6 +87,7 @@ library
         blaze-html,
         bytestring,
         case-insensitive,
+        conduit,
         containers,
         unordered-containers,
         directory,
@@ -101,7 +102,9 @@ library
         monad-logger,
         mtl,
         network-uri,
+        random,
         resource-pool,
+        template-haskell,
         postgresql-simple,
         punycode,
         tmp-postgres,