Remove Load method that accepts a Url

[darrelmiller]

We should remove this overload. Accessing a URL is an asynchronous process, if a caller wants to hide it behind a sync call, then that is their responsibility.

OpenAPI.NET/src/Microsoft.OpenApi/Reader/OpenApiModelFactory.cs

Line 34 in 1338905

public static ReadResult Load(string url, OpenApiReaderSettings settings = null)