Provide a property that configures webclient/webtestclients default timeout globally

[nightswimmings]

I think, WebClient/WebTestClient(Builder) should be able to configure defaults through properties, especially timeout and especially for WebTestClient, since its a setup most people would tune in order to being able to debug for long time and not get a connection exception.

Kind of @AutoConfigureWebTestClient(timeout = "10000"), but through properties on a global scope.

My apologies if such a setup exists, I could not find it in issues nor spring-boot-properties docs