Add list statement support with tests for creation, access, and errors

YesNt.Interpreter/Runtime/FunctionScope.cs

@@ -6,7 +6,8 @@ internal class FunctionScope(int callerLine, Stack<string> arguments)
 {
     public int CallerLine { get; } = callerLine;
     public Dictionary<string, string> Variables { get; } = [];
+    public Dictionary<string, List<string>> Lists { get; } = [];
     public Dictionary<string, int> Labels { get; } = [];
     public Stack<string> Arguments { get; } = arguments;
     public Stack<string> Results { get; } = new();
-}
+}

YesNt.Interpreter/Runtime/RuntimeInformation.cs

@@ -15,6 +15,7 @@ internal sealed class RuntimeInformation
 
     private static int internalTaskId = 0;
     private readonly Dictionary<string, string> topVariables = [];
+    private readonly Dictionary<string, List<string>> topLists = [];
     private readonly Dictionary<string, int> topLabels = [];
     private RuntimeInformation parentRuntimeInformation;
     private int taskId = 0;
@@ -43,6 +44,7 @@ internal sealed class RuntimeInformation
     }
 
     public Dictionary<string, string> Variables => FunctionCallStack.Count == 0 ? topVariables : FunctionCallStack.Peek().Variables;
+    public Dictionary<string, List<string>> Lists => FunctionCallStack.Count == 0 ? topLists : FunctionCallStack.Peek().Lists;
 
     public Dictionary<string, int> Labels => FunctionCallStack.Count == 0 ? topLabels : FunctionCallStack.Peek().Labels;
 
@@ -148,6 +150,7 @@ internal sealed class RuntimeInformation
     public void Reset()
     {
         topVariables.Clear();
+        topLists.Clear();
         Lines.Clear();
         GlobalVariables.Clear();
         Labels.Clear();
@@ -176,4 +179,4 @@ internal sealed class RuntimeInformation
     {
         Exit($"Terminated by parent task", stopAllTasks);
     }
-}
+}