Add non-generic GetVariable method and Python accessors

A non-generic version of GetVariable method has been added to the ExecutionContextProxy.cs, allowing direct access to variables without specifying a type. To leverage this, Python accessors for getting and setting workflow variables have been added to GenerateWorkflowVariableAccessors.cs. This enhances the interaction between the Python scripts and the context variables.

src/modules/Elsa.Python/Handlers/GenerateWorkflowVariableAccessors.cs

@@ -23,6 +23,12 @@ public Task HandleAsync(EvaluatingPython notification, CancellationToken cancell
         sb.AppendLine("    def __init__(self, execution_context):");
         sb.AppendLine("        self.execution_context = execution_context");
         sb.AppendLine();
+        sb.AppendLine("    def get(self, name):");
+        sb.AppendLine("        return self.execution_context.GetVariable(name)");
+        sb.AppendLine();
+        sb.AppendLine("    def set(self, name, value):");
+        sb.AppendLine("        self.execution_context.SetVariable(name, value)");
+        sb.AppendLine();
 
         foreach (var variable in variables)
         {

src/modules/Elsa.Python/Models/ExecutionContextProxy.cs

@@ -28,6 +28,11 @@ public ExecutionContextProxy(ExpressionExecutionContext expressionExecutionConte
     /// Gets the value of the specified variable.
     /// </summary>
     public object? GetVariable<T>(string name) => ExpressionExecutionContext.GetVariableInScope(name).ConvertTo<T>();
+
+    /// <summary>
+    /// Gets the value of the specified variable.
+    /// </summary>
+    public object? GetVariable(string name) => ExpressionExecutionContext.GetVariableInScope(name);
 
     /// <summary>
     /// Sets the value of the specified variable.