Utilize LSP completion itemDefaults a bit

Tailwind likes to throw a lot of completion data at us, this gets it to
send less. Previously it would respond to a completion with 2.5 MB JSON
blob, now it is more like 0.8 MB.

Relies on a local copy of lsp-types with the `itemDefaults` field added.
I don't have write perms to push to our fork of the crate atm, sorry :)

crates/lsp/src/lsp.rs

@@ -423,6 +423,14 @@ impl LanguageServer {
                             }),
                             ..Default::default()
                         }),
+                        completion_list: Some(CompletionListCapability {
+                            item_defaults: Some(vec![
+                                "commitCharacters".to_owned(),
+                                "editRange".to_owned(),
+                                "insertTextMode".to_owned(),
+                                "data".to_owned(),
+                            ]),
+                        }),
                         ..Default::default()
                     }),
                     rename: Some(RenameClientCapabilities {