instrument the Api and propagate required Debug impls

[clux]

Experiment with tracing primarily for use with the example controller-rs repo via kube-rs/controller-rs#10

[clux]

I might flesh this out more, but happy to take some comments here now.

[clux]

Span result:

• One span around the Api call with non-self parameters traced as tags for timing information
• One trace log from kube::service::log for KUBE=trace enabled stdout users

And importantly, tracing automatically associates the two.

[clux]

Probably merging this tomorrow unless there are any objections.

The only thing that I feel is possibly contentious here is the extra Debug requirements (and we might be able to elide some of that in the future judging from the valuable channel), but for now, they are needed to drop kube parameters into trace values.

[clux]

Released in 0.52.0.