Liquid Expression usage in console app

[jskumar]

In console app, Liquid Expressions is not working as expected but CSharp Expressions works. Could you please review and help me to handle this.

@cvijayak Thanks.

 ```
var host = Host.CreateDefaultBuilder()
.ConfigureServices((context, services) =>
{
services.AddMediator();
services.AddElsa(elsa => {
elsa.UseCSharp();
elsa.UseLiquid();
});
services.AddHostedService();
})
.Build();
await host.RunAsync();

using (var scope = _serviceProvider.CreateScope())
{
var evaluator = scope.ServiceProvider.GetRequiredService();

var executionContext = new ExpressionExecutionContext(scope.ServiceProvider, new MemoryRegister());
executionContext.SetVariable("Name", "Context World");

string e1 = "DateTime.Now.AddDays(1).ToString("yyyy-MM-dd")";
var r1 = await evaluator.EvaluateAsync(new Expression("CSharp", e1), executionContext);
Console.WriteLine(r1);

string e3 = ""Hello, " + Variable.Name";
var r3 = await evaluator.EvaluateAsync(new Expression("CSharp", e3), executionContext);
Console.WriteLine(r3); // Hello, Context World

string e4 = "Hello {{ Variables.Name }}";
var r4 = await evaluator.EvaluateAsync(new Expression("Liquid", e4), executionContext);
Console.WriteLine(r4);

}

Thanks again.