remove unused UtilsTest and Tests files; add UtilsTests in NUnit for endpoint parsing and utility functions

Author: lausannel

samples/Apache.IoTDB.Samples/Program.cs

@@ -50,9 +50,6 @@ public static async Task Main(string[] args)
 
             rootCommand.SetHandler(async (string single, List<string> multi) =>
             {
-                var utilsTest = new UtilsTest();
-                utilsTest.TestParseEndPoint();
-
                 SessionPoolTest sessionPoolTest;
 
                 if (!string.IsNullOrEmpty(single) && (multi == null || multi.Count == 0))