WithParsed(async swallows exceptions

### Some examples of the use of WithParsed / WithParsedAsync with expected behavior
```
internal static class Program
{
private static void Main(string[] args)
{
Parser.Default.ParseArguments(args).WithParsed(_ => throw new Exception());
```
=> Unhandled exception. System.Exception: Exception of type 'System.Exception' was thrown.
As Expected.

```
internal static class Program
{
private static async Task Main(string[] args)
{
await Parser.Default.ParseArguments(args).WithParsedAsync(_ => throw new Exception());
```
=> Unhandled exception. System.Exception: Exception of type 'System.Exception' was thrown.
As Expected.

```
internal static class Program
{
private static async Task Main(string[] args)
{
await Parser.Default.ParseArguments(args).WithParsedAsync(async _ =>
{
await Task.CompletedTask; //just for demonstration
throw new Exception();
});
```
=> Unhandled exception. System.Exception: Exception of type 'System.Exception' was thrown.
As Expected.

### When using WithParsed with an async expresion in a synchrone context, it swallows the exception

```
internal static class Program
{
private static void Main(string[] args)
{
Parser.Default.ParseArguments(args).WithParsed(async _ =>
{
await Task.CompletedTask; //just for demonstration
throw new Exception();
});
```
=> Process finished with exit code 0.
Should also notify about Unhandled exception.

Comece pelos pontos de entrada WithParsed e WithParsedAsync e reproduza o exemplo de contexto síncrono usando Parser.Default.ParseArguments. Compare o comportamento de um callback síncrono com o de um callback assíncrono passado para WithParsed. A tarefa estará concluída quando as exceções do callback assíncrono não forem mais silenciosamente ignoradas e o comportamento estiver coberto por um teste de regressão.

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