Fix JSONClient timeout so that requests actually abort on timeout

[cnrudd]

We noticed while looking at client logs, that requests that are setup with 30s or 1mn timeouts can sometimes not abort/hangup once the timeout is reached. We've seen requests last up to ~10mn.

As explained in this post
https://www.baeldung.com/httpclient-timeout
our current timeout configs do not hard abort a request.

The consequences are that under heavy load and slow response times from a remote host, our server is not freeing up request threads as fast as we thought, and performance is degrading.

To get real request aborts, we want to add a TimerTask with a method.abort() call to the method passed into https://github.com/xh/hoist-core/blob/develop/src/main/groovy/io/xh/hoist/http/JSONClient.groovy#L145