Add a new `WebServiceMessageSenderFactory` factory interface to replace
`HttpWebServiceMessageSenderBuilder`. The factory provides a general
purpose way of creating `WebServiceMessageSender` instances, but most
typically will be `ClientHttpRequestMessageSender` created from a
`ClientHttpRequestFactoryBuilder`.
A new `httpMessageSenderFactory` method has been added to the
`WebServiceTemplateBuilder` class. This allows any sender to be
plugged into the template.
Closes gh-42886
6356e904fc