Add support for Call Hierarchies in language server (#35176)

* Add support for Call Hierarchies in language server

* Use baselines for callHierarchy tests

* Clean up commented code

* Support multiple hierarchy items when an implementation can't be found

* Use optional chaining in a few places

* Use getFileAndProject

src/services/tsconfig.json

@@ -18,6 +18,7 @@
         "documentRegistry.ts",
         "importTracker.ts",
         "findAllReferences.ts",
+        "callHierarchy.ts",
         "getEditsForFileRename.ts",
         "goToDefinition.ts",
         "jsDoc.ts",