Parser constructor is missing overload with ParserSettings argument

I wanted to write this code, because this seems to be the most intuitiv way:
```csharp
ParserSettings settings = new()
{
AutoHelp = true,
AutoVersion = true,
CaseInsensitiveEnumValues = true,
CaseSensitive = false,
IgnoreUnknownArguments = true,
ParsingCulture = System.Globalization.CultureInfo.InvariantCulture,
};
Parser parser = new(settings);
```

But it doesn't work, because Parser doesn't have constructor with ParserSettings argument.

This also doesn't work:
```csharp
Parser parser = new() { Settings = settings };
```
because `Settings` is read-only.

So, there should be this constructor overload to initialize Parser with existing settings.