Added pretty-printing of type parameters in CameLIGO.

type:none

• has a changelog entry

This MR fixes point 4 of #1374 and declarations of polymorphic types as well.

changelog/1648041599

+---
+  title: "Added pretty-printing of type parameters to CameLIGO."
+  merge_request: "1653"
+  author: "Christian Rinderknecht"
+  type: "fixed"
+