We should provide adapters for building all HttpClient variants

[jayv]

Today we only have StreamingHttpClientAdapter which facilitates creation of StreamingHttpClient filters given it helps with providing the StreamingHttpRequestResponseFactory and delegating all method calls. We don't have the equivalent adapter for the other programming models to allow users to create filters at that API layer. For example users at the BlockingHttpClient API layer can't create a BlockingHttpClient filter, they are forced to write a filter using the StreamingHttpClient API.