Log explicit response body in case of HTTP errors

[hiddewie]

Thanks for the great plugin!

I was running into a configuration error, and the (Gradle) exception message was the following

> Failed to load staging profiles, server at https://s01.oss.sonatype.org/service/local/staging/deploy/maven2/ responded with status code 400, body: io.github.gradlenexus.publishplugin.shadow.okhttp3.ResponseBody$1@527c85e2

It would be very nice to see the full response body, because that usually tells more about the problem than a plain object reference.

[szpak]

It is somehow tricky with HTTP responses - can be consumed just once. Nevertheless, we don't expect very large responses in our calls (to risk OutOfMemory) and probably in the majority of cases (POSTs) we don't rely on the value, so it should be possible to improve.

Btw, @hiddewie Would you like to give it a shot? ;-)

[hiddewie]

Definitely!

The error response can be read in total I think, because it will never be used later, because a RuntimeException is thrown directly after reading the body.

[hiddewie]

See linked PR #92