Add an analyzer for new objects in OnConfiguring that are used as part of the ServiceProvider key

For example, correct configuration:
```C#
o.HttpClientFactory(this.SomeFlag ? () => new HttpClient() : () => StaticClient)
```

Incorrect configuration that will result in a different ServiceProvider key for each context instance:

```C#
o.HttpClientFactory(() => this.SomeFlag ? new HttpClient() : StaticClient)
```

This also applies to `WebProxy`, `UseMemoryCache`, `DefaultAzureCredential` and the new model interceptor.

However, this isn't an issue if the specified lifetime for options is `Singleton`