Support HEAD and OPTIONS methods

[Atulin]

Immediate.Apis does not support all HTTP request methods, that is:

• GET
• POST
• DELETE
• PATCH
• PUT
• OPTIONS
• HEAD
• CONNECT
• TRACE

Minimal APIs handle the less-commonly used ones (OPTIONS, HEAD, CONNECT, TRACE) as well as the proposed QUERY method and any custom method a user might want to handle via the MapMethods() extension method like so:

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

// OPTIONS: /foo
// HEAD: /foo
app.MapMethods("/foo", [ "OPTIONS", "HEAD" ], () => "Options or head");

// TRACE: /bar
app.MapMethods("/bar", [ "TRACE" ], (Data data) => $"Received {data.Name}");

app.Run();

so it would be nice to have an attribute that can replicate this functionality, for example

[Handler]
[MapMethods("ping", [ "HEAD" ])]
public static partial class HeadHandler
{
    // ...
}