feat(lsp): Support goto definition on exceptions (#1895)

Co-authored-by: Blaine Bublitz <blaine.bublitz@gmail.com>

Author: spotandjake

compiler/src/language_server/sourcetree.re

@@ -394,6 +394,20 @@ module Sourcetree: Sourcetree = {
                        },
                   ]
                   @ segments^;
+              | TExpConstruct(_, desc, _) =>
+                segments :=
+                  [
+                    (
+                      loc_to_interval(exp.exp_loc),
+                      Value({
+                        env: exp.exp_env,
+                        value_type: desc.cstr_res,
+                        loc: exp.exp_loc,
+                        definition: Some(desc.cstr_loc),
+                      }),
+                    ),
+                    ...segments^,
+                  ]
               | _ =>
                 segments :=
                   [