Set default parameter value if provided in RDG

[captainsafia]

Give the code:

string HandleRequest(string name = "Safia") => $"Hello {name}!";
app.MapGet("/hello", HandleRequest);

We emit the following code:

var name_raw = name_RouteOrQueryResolver(httpContext);
var name_temp = name_raw.Count > 0 ? (string?)name_raw : null;
string name_local = name_temp!;

When we should be emitting:

var name_raw = name_RouteOrQueryResolver(httpContext);
var name_temp = name_raw.Count > 0 ? (string?)name_raw : "Safia";
string name_local = name_temp!;

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We're moving this issue to the .NET 8 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s).
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