Invoke configOptions callback directly to derive event binders during Maui init #4216

For context see:

• MAUI CommunityToolkit MVVM auto instrumentation of async commands #4125 (comment)

We can address all of Allan's concerns by using the second method from the benchmark fork:

That way people still setup the new integration as an extension on SentryOptions (i.e. from within the call to UseSentry) and we don't build a service provider to resolve the options. The time required to do this would be absolutely trivial, regardless of the container technology that people have chosen... and we can do this without creating any extra benchmarks.