Add another TS language path

Author: dibarbet

src/Features/LanguageServer/Protocol/LanguageInfoProvider.cs

@@ -37,6 +37,7 @@ internal class LanguageInfoProvider : ILanguageInfoProvider
             { ".cjs", s_typeScriptLanguageInformation },
             { ".mjs", s_typeScriptLanguageInformation },
             { ".cts", s_typeScriptLanguageInformation },
+            { ".mts", s_typeScriptLanguageInformation },
         };
 
         public LanguageInformation GetLanguageInformation(string documentPath, string? lspLanguageId)