typescript: Complete function calls with snippets (#11157)

This allows function call (i.e. snippet) completion with
`typescript-language-server`. So far that didn't work, because
`typescript-language-server` doesn't respond with `insertText` when
getting the completions, but only when then sending
`completionItem/resolve` requests. See:
https://github.com/hrsh7th/nvim-cmp/issues/646#issuecomment-992765479

What this PR does is to support text edits in the response to
`completionItem/resolve`, which means updating the completion item.

It then enables this feature by default for
`typescript-language-server`.


TODOs:

- [x] Make this work over collab
- [x] Test that this doesn't break existing language server support
- [x] Refactor duplicated code

Release Notes:

- Added support for function call completion when using
`typescript-language-server`. This will result in parameters being
added, which can then be changed and navigated with `<tab>`. For this to
work with `typescript-language-server`, the documentation for a given
completion item needs to be resolved, meaning that if one types very
quickly and accepts completion before `typescript-language-server` could
respond with the documentation, no full function completion is used.

Demo:


https://github.com/zed-industries/zed/assets/1185253/c23ebe12-5902-4b50-888c-d9b8cd32965d

crates/languages/src/typescript.rs

@@ -186,6 +186,18 @@ impl LspAdapter for TypeScriptLspAdapter {
         })))
     }
 
+    async fn workspace_configuration(
+        self: Arc<Self>,
+        _: &Arc<dyn LspAdapterDelegate>,
+        _cx: &mut AsyncAppContext,
+    ) -> Result<Value> {
+        Ok(json!({
+            "completions": {
+              "completeFunctionCalls": true
+            }
+        }))
+    }
+
     fn language_ids(&self) -> HashMap<String, String> {
         HashMap::from_iter([
             ("TypeScript".into(), "typescript".into()),