Expose Feign logging to enable better debugging of serialization issues

[jcrater]

When trying to track down de/serialization issues, it's really helpful to see the raw json that is sent back. Feign supports logging this, but conjure doesn't expose a knob to enable it.

https://github.com/palantir/conjure-java-runtime/blob/b401608a507e97ea7ceccebc8a4ead22cd44900d/conjure-java-jaxrs-client/src/main/java/com/palantir/conjure/java/client/jaxrs/AbstractFeignJaxRsClientBuilder.java#L102

[iamdanfox]

One thing that has been floated in the past is the idea of printing out the equivalent curl command? That way you could run the curl command from the box and capture the exact output.

This also avoids us having to re-serialize things, or deal with potentially binary responses?

[jcrater]

That seems like a clever approach, and it would satisfy the need here so long as the curl command is usable out of the logs without a bunch of fiddling.

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