Enable parallel test execution, mark timing-sensitive test as non-parallel, and use Interlocked for TaskId

YesNt.Interpreter.Tests/AssemblyInfo.cs

@@ -0,0 +1,3 @@
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+[assembly: Parallelize(Workers = 0, Scope = ExecutionScope.MethodLevel)]

YesNt.Interpreter.Tests/ConsoleStatementsTests.cs

@@ -76,6 +76,7 @@ public class ConsoleStatementsTests
     }
 
     [TestMethod]
+    [DoNotParallelize] // timing-sensitive: relies on Thread.Sleep to let the interpreter reach %read_key
     public void ReadKeyCanBeInterruptedByStopTest()
     {
         YesNtInterpreter interpreter = new YesNtInterpreter();

YesNt.Interpreter/Runtime/RuntimeInformation.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Threading;
 
 using YesNt.Interpreter.Utilities;
 
@@ -191,7 +192,7 @@ internal sealed class RuntimeInformation
         IsLocalSearch = false;
         LineNumber = 0;
 #pragma warning disable S2696 // internalTaskId is a shared counter intentionally incremented by each Reset call
-        TaskId = ++internalTaskId;
+        TaskId = Interlocked.Increment(ref internalTaskId);
 #pragma warning restore S2696
     }