Fix to language service

Author: madskristensen

src/toolkit/Community.VisualStudio.Toolkit.Shared/LanguageService/LanguageBase.cs

@@ -53,6 +53,13 @@ public LanguageBase(object site)
             _languageServiceId = GetType().GUID;
         }
 
+        /// <inheritdoc/>
+        public override int GetLanguageName(out string name)
+        {
+            name = Name;
+            return VSConstants.S_OK;
+        }
+
         /// <inheritdoc/>
         public abstract override string Name { get; }
 
@@ -79,6 +86,12 @@ public override LanguagePreferences GetLanguagePreferences()
             return _preferences;
         }
 
+        /// <inheritdoc/>
+        public override IScanner GetScanner(IVsTextLines buffer) => null!;
+
+        /// <inheritdoc/>
+        public override AuthoringScope ParseSource(ParseRequest req) => null!;
+
         /// <inheritdoc/>
         public override string GetFormatFilterList()
         {