Goto links for LSP hover (#4539)

This is a subset of https://github.com/FuelLabs/sway/pull/4532/files.
I'm trying to narrow down why some of the e2e tests are failing. This PR
contains the changes for the "Go to type" links only, excluding the
changes in sway-core that were needed for "Goto implementations" to
work.

Closes #2852

<img width="673" alt="image"
src="https://user-images.githubusercontent.com/47993817/236371214-0b82b509-9a59-4575-b1d1-5acd505da255.png">

- [x] I have linked to any relevant issues.
- [x] I have commented my code, particularly in hard-to-understand
areas.
- [ ] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [ ] I have added tests that prove my fix is effective or that my
feature works.
- [ ] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [x] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [ ] I have requested a review from the relevant team or maintainers.

sway-core/src/language/call_path.rs

@@ -1,6 +1,6 @@
 use std::{fmt, sync::Arc};
 
-use crate::{Ident, Namespace};
+use crate::{namespace::Module, Ident};
 
 use sway_types::{span::Span, Spanned};
 
@@ -100,7 +100,7 @@ impl CallPath {
     ///
     /// Paths to _external_ libraries such `std::lib1::lib2::my_obj` are considered full already
     /// and are left unchanged since `std` is a root of the package `std`.
-    pub fn to_fullpath(&self, namespace: &mut Namespace) -> CallPath {
+    pub fn to_fullpath(&self, namespace: &Module) -> CallPath {
         if self.is_absolute {
             return self.clone();
         }
@@ -123,11 +123,11 @@ impl CallPath {
             let mut prefixes: Vec<Ident> = vec![];
 
             if !is_external {
-                if let Some(pkg_name) = &namespace.root().module.name {
+                if let Some(pkg_name) = &namespace.name {
                     prefixes.push(pkg_name.clone());
                 }
 
-                for mod_path in namespace.mod_path() {
+                for mod_path in &namespace.mod_path {
                     prefixes.push(mod_path.clone());
                 }
             }
@@ -149,10 +149,10 @@ impl CallPath {
                 self.clone()
             } else {
                 let mut prefixes: Vec<Ident> = vec![];
-                if let Some(pkg_name) = &namespace.root().module.name {
+                if let Some(pkg_name) = &namespace.name {
                     prefixes.push(pkg_name.clone());
                 }
-                for mod_path in namespace.mod_path() {
+                for mod_path in &namespace.mod_path {
                     prefixes.push(mod_path.clone());
                 }
 

sway-lsp/src/capabilities/hover/hover_link_contents.rs

@@ -78,11 +78,10 @@ impl<'a> HoverLinkContents<'a> {
             });
         };
     }
-
     /// Adds all implementations of the given [TyTraitDecl] to the list of implementations.
     pub fn add_implementations_for_trait(&mut self, trait_decl: &TyTraitDecl) {
         if let Some(namespace) = self.session.namespace() {
-            let call_path = CallPath::from(trait_decl.name.clone()); //.to_fullpath(&namespace);
+            let call_path = CallPath::from(trait_decl.name.clone()).to_fullpath(&namespace);
             let impl_spans = namespace.get_impl_spans_for_trait_name(&call_path);
             self.add_implementations(&trait_decl.span(), impl_spans);
         }