chore(users/Profpatsch): Move Multipart2 into new webstuff package

Change-Id: I903f1b554beed1240d2a9cf14ff44d1f3cb41ec5
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9013
Tested-by: BuildkiteCI
Autosubmit: Profpatsch <mail@profpatsch.de>
Reviewed-by: Profpatsch <mail@profpatsch.de>

users/Profpatsch/hie.yaml

@@ -2,6 +2,8 @@ cradle:
   cabal:
     - path: "./my-prelude"
       component: "lib:my-prelude"
+    - path: "./my-webstuff"
+      component: "lib:my-webstuff"
     - path: "./netencode"
       component: "lib:netencode"
     - path: "./arglib"